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Area and circumference of a circle Worksheet PDF

Super Teacher Worksheets - www.superteacherworksheets.com Circumference & Area of a Circle Find the circumference and area of each circle. Use 3.14 for pi. Find the missing measurements. C = 2 x π x r r = 5 cm π ≈ 3.14 C = 2 x 3.14 x 5 cm C = 31.40 cm 5 cm A = πr2 r = 5 cm π ≈ 3.14 A = 3.14 x (5 cm x 5 cm) A = 3.14 x 25 cm2 A = 78.50. Y Worksheet by Kuta Software LLC Find the area of each. Round to the nearest tenth. 9) 12 ft 10) 10 cm 11) 8 m 12) 4 m 13) 20 yd 14) 34 ft 15) radius = 8 ft 16) radius = 5 cm Find the diameter of each circle. 17) area = 4 π in² 18) area = 49 π yd² 19) circumference = 162 π yd 20) circumference = 30 π yd-2 A circle has a radius of 6.1 cm. Work out the circumference of the circle. Give your answer correct to 3 significant figures... (3 marks) 7. The radius of a circle is 6.4 cm. Work out the circumference of this circle. Give your answer correct to 1 decimal place... (3 marks) 8. The radius of the circle is 9.7 cm. Work out the area of the.

Find the area from the circumference of each circle in this stock of worksheets for 7th grade students. Word problems included to understand real-life application. Applying the formula, Circumference = 2 * pi * r, find the circumference of each circle. To find the circumference, multiply diameter with pi value. Each pdf worksheet has 9 problems Circumference of a Circle To find the circumference of a circle, use the formula 2 x pi x radius = circumference. This formula is often written as C = 2 x z x r. The circle pictured here has a radius of 5 cm. r = 5 cm z = 3.14 2 x 3.14x5 cm = 31.4 cm Find the circumference of each circle. Use 3.14 for pi. g. Mr. Tobias is buying new tires for.

Basic Pre-algebra Skill Finding the Area of a Circle Find the area of each. Round to the nearest tenth. 1) 12 mi 2) 5.2 km 3) 6.4 mi 4) 3 yd 5) 5 f Circle Review Worksheet Name: _____ Hour: _____ Date:_____ Find the radius, diameter, circumference and area of the circle below. Area Diameter: Find the radius, diameter, circumference and the approximate area for each circle below. To find the approximate area, please use 3.14 for π. SHOW WORK! 1) 2) 3). Area = Area = Area = Area = Area = Area = Area = Area = Area = 13 ft 12 in 5 yd 8 yd t 7 in t 11 in 6 yd Example : 4 ft Area of a circle = r Radius (r) = 4 ft Area = !r = ! x 4 x 4 Area = 16 ft Name : Circle - Area Printable Worksheets @ www.mathworksheets4kids.com Radius: ES1 Find the area of each circle in terms of !

Practice worksheet on the radius, diameter, circumference, and area of a circle. Formulas: 1) Circumference C = or C= 2) Diameter, d = 2r and radius , 3) Area of a circle , A = π r2 -----1) . The radius of a circle is 5 inches. What is the (a) diameter (b) circumference (c) area Printable Math Worksheets @ www.mathworksheets4kids.com Area & Circumference Find the area and circumference of each circle. Round the answer to two decimal places. ( use !=3.14 ) 1) Radius = Diameter = Area = Circumference = 2) Radius = Diameter = Area = Circumference = 3) Radius = Diameter = Area = Circumference = 4) Radius = Diameter = Area. Students can use math worksheets to master a math skill through practice, in a study group or for peer tutoring. Use the buttons below to print, open, or download the PDF version of the Circumference and Area of Circles (A) math worksheet. The size of the PDF file is 43843 bytes. Preview images of the first and second (if there is one) pages. 11) Find the area of the circle pictured below, rounding your answer to 3 significant figures 12 cm [1] 12) Find the radius of a circle which has an area of 39 cm 2 [1] 13) Find the circumference of the circle pictured below, rounding your answer to 3 significant figures 9 cm [1] 14) Find the radius of a circle, where the circumference is: 44. 1 The diameter,d, of a circle is 4.8 cm. Work out its area correct to the nearest cm2. d Work out the circumference of the circle. Give your answer in terms of . 2 The diameter, d, of a circle is 12 m. www.examqa.co

Cazoom has provided a number of worksheets with everything your student or child will need when studying circles.Knowing how to calculate the area and circumference of circles is an important aspect of math, that is why we have also provided the formulas so each child will soon be an ace at all things circles! Our circle problems worksheets have also been provided with answers Circle Worksheets. This generator makes worksheets for calculating the radius, diameter, circumference, or area of a circle, when one of those is given (either radius, diameter, circumference, or area is given). They can be made in PDF or html formats. Options are numerous: you can choose metric or customary units or both, you can include or. UB SAT 2009 . Worksheet #23a . Circles . 1. If the area of a circle is 64 , then the circumference of the circle is (A) 8 (B) 16 (C) 32 (D) 64 (E) 12 Worksheet by Kuta Software LLC-2-15) circumference = 20p ft 16) circumference = 18p mi Find the radius of each circle. 17) circumference = 24p km 18) circumference = 10p cm 19) circumference = 20p km 20) circumference = 8p mi Find the diameter of each circle. 21) circumference = 24p m 22) circumference = 4p f

Circumference and Area of Circles Worksheet

Circle worksheets: Finding the circumference. Below are our grade 5 geometry worksheets on determining the circumference of circles. Students are provided the radius or the diameter in customary units (worksheets 1-3) or metric units (worksheets 4-6). Open PDF Circle worksheets: finding the area. Students determine the area of circles given the radius or the diameter. Worksheets 1-3 are in customary units; 4-6 are metric. All worksheets are printable pdf files. Open PDF Find the area of a circle inscribed in a square of side 20 cm. Answers for worksheet on circumference and area of circle are given below to check the exact answers of the above questions.Answers: 1. (a) 75³/₇ cm (b) 45.25 cm (c) 94²/₇ cm 2

Area of a Circle Practice Questions - Corbettmaths. Menu Skip to content. Welcome. Videos and Worksheets. Primary. 5-a-day. expand child menu. 5-a-day GCSE 9-1 Circumference of circles worksheet for 6th grade children. This is a math PDF printable activity sheet with several exercises. It has an answer key attached on the second page. This worksheet is a supplementary sixth grade resource to help teachers, parents and children at home and in school pdf, 273.18 KB docx, 152.97 KB To be used after both area and Circumference has been taught as a consolidation lesson or as a revision lesson towards exam time. This worksheet also includes compound shapes made with circles Area and circumference of a circle word problems worksheet answers pdf This Circle Worksheet is great for practicing solving for the circumference, area, radius and diameter of a circle. The worksheet will produce 9 problems per page. This worksheet is a great resources for the 5th, 6th Grade, 7th Grade, and 8th Grade Area and Circumference of a Circle - Matching Worksheet Match the word problems to their answers. Write the letter of the answer that matches the problem. Use 3.14 for pi. Units of measurements are removed. _____ 1. Patricia buys a round dinner table. The radius of dinner table is 6 meters. What is the area of table? a. 56.52 _____ 2

Circumference and Area of Circles (A) - Free Math Worksheet

Circle, Area and Circumference Worksheet.pdf - Name Score Teacher Date | Solve the missing elements for each problem Use 3.14 for ~ E N C 1 2 C 3 K D Finding the Circumference of a Circle Find the circumference of each circle. Round to the nearest tenth. 1) 11 ft 2) 7 yd 3) 6.3 m 4) 11.8 ft 5) 2 km 6) 9 mi 7) 6 ft 8) 8.4 ft 9) 7.4 km 10) 8 m-1-11) 4 m 12) 22 mi 13) 5 m 14) 8 yd 15) 16.8 m 16) 6 cm 17) 14 in 18) 16 km 19) 10 i Circles Task Cards Area and Circumference 25. 20.41 in 26. 47.1 in 27. 36.11 in 28. 12.56 in 29. 32 meters 30. 28 sq in 31. 75.36 mm 32. 11 in Answer Key ***note- all answers are given in full form. You can decide which place value you would like your students to round to**

worksheet is perfect for solving the circumference, area, radius and diameter of the circle. The worksheet causes 9 problems per page. This worksheet is a great resource for the fifth, sixth, seventh, and eighth class numbers Free printable worksheets for area circumference diameter and radius of circle available in both pdf and html formats. Some of the worksheets displayed are finding the circumference of a circle 11 circumference and area of circles circle circumference of a circle area circumference circles date period circle review work radius diameter.

Area and Circumference of a Circle worksheet PDF Circles

Area and circumference of semicircles worksheet undergraduate 7 students learn how to give an informal derivation of the relationship between circumference and the area of a circle. Download the worksheets for Grade 7, Module 3, Lesson 18 • Students learn to examine the meaning of the room circle and the semicircle. circumference or. (a) know that measurements must be in the same units before calculating area (b) know how to break down a composite shape into regular shapes. Perimeter, Circumference & Area - Answers 1. a) area = 32m2 For example: 8 + 24 b) perimeter = 28m For example: 8 + 6 + 4 + 4 + 4 + 2 2. area of pond = 3.14 x 2.52 = 19.625m

Circles. Show your smarts by solving our free worksheets on the circumference of a circle and calculating the distance around a circle. Our pdf exercises help master finding the circumference in terms of pi as well as by using the decimal value 3.14 for pi. The radius or diameter of circles is expressed in customary as well as metric units Circumference of a Circle Worksheets. Tags: 6th Grade 7th Grade. Download PDF. Download PDF. Download PDF

These math worksheets help students to develop a strong knowledge of geometry and its related concepts which are important. Children can download the PDF format of these easily accessible Area and Circumference of a Circle worksheets to practice and solve questions for free. Area and Circumference of a Circle Worksheet - 1. Download PDF Area, Perimeter, and Circumference Worksheet page 2 2. The owners want wood flooring in the Dining Room and Kitchen. What is the area of the floor in those two rooms? Be sure to subtract the area of the cabinets. 3. The owners want the fireplace to have a stone floor. The diameter is 6'. How many squar

Free worksheets for area, circumference, diameter, and

  1. Circumference area worksheet for 7th grade children. This is a math PDF printable activity sheet with several exercises. It has an answer key attached on the second page. This worksheet is a supplementary seventh grade resource to help teachers, parents and children at home and in school
  2. ID: 1537855 Language: English School subject: Math Grade/level: 7 Age: 11-13 Main content: Measurement Other contents: Add to my workbooks (3) Download file pdf Embed in my website or blog Add to Google Classroo
  3. Standard. PDF. Small. PDF. Circle Vocabulary Area of a Circle Area of a Circle in Terms of π. Area & Circumference of a Circle Lengths of Arcs Areas & Perimeters of Full & Partial Circles

A worksheet going over the area and circumference of circles with some challenging problems toward the bottom. ID: 1181346. Language: English. School subject: Math. Grade/level: 7. Age: 11-13. Main content: Circle. Other contents: Geometry, Circles, Area of Circles, Circumference of Circles. Add to my workbooks (40 Find the area of square length whose edges are given below: (i) 15 m (ii) 250 m (iii) 25 cm Triangles Circumference Worksheet Dimensions calculate the circumference of the ekenar, isol and scale triangles containing integers, deeds, and fractions

Area of Circles - Worksheet

Included in the lesson development: Circumference/Area Guided Practice Worksheet. B. Independent Practice: Circumference and Area Worksheet . IV. Closure. Have students revisit the opening problem: Your dog, Fido, has been a very bad puppy. He has ruined the grass around the tree that he is tied to. Fido is tied to a 10 foot rope Circumference of Circle List of important formulas: OR Where, C = Circumference of circle, r = radius and d= diameter of circle. Value of . Practice Problems. Find the circumference of a circle of diameter 20cm. Assume . Calculate the circumference of a circular disc of radius 21 in? Use Home - Lynden Middle Schoo Free Math 7 Worksheets. Find the area of triangles, worksheet #1. Find the area of triangles, worksheet #2. Find the area of parallelograms. Find the area of triangles and parallelograms, worksheet #1. Find the area of triangles and parallelograms, worksheet #2. Find the area of trapezoids. Find the area of circles A = r² Press Then x 7squared A = 153.9cm² (1 d.p.) 14cm ? 7cm r = ½ x 14 = 7cm A = 7² 7 On your worksheet use to work out the area of each circle. The AREA A = r² 24m BONUS What is the area of this semi-circle? A = r² A semicircle is half a circle

pdf, 494.17 KB This worksheet scaffolds the thinking processes behind finding the area of a circle from the radius and diameter. So the red section has the same difficulty questions but the thinking skills have been simplified Area Of A Circle Gcse. Area Of A Circle Gcse - Displaying top 8 worksheets found for this concept.. Some of the worksheets for this concept are Mathematics linear 1ma0 area circumference of circles, 11 circumference and area of circles, Circles perimeters and sectors, Area and perimeter, Area perimeter h f, Area of circle work pdf, 9 area perimeter and volume mep y9 practice book b, Arc length. glencoe.co The radius of the circle is 9.7 cm. Worksheet Circumference of a circle.pdf 99 KB, Adobe Acrobat.b solve practical problems involving circumference and area of a circle, given the. endobj FK 3 ! AH dq5 ւ08 :N0 k 1^pk L 2 xh].5 sWҦ ͺ B c \A M v eq ڣ [\ h9*f+Ԩκ b B{ (. Below is a lesson and worksheet to learn this application of area of a circle: Feel free to print the following pdf version of the lesson and worksheet on area of a circle word problem involving clocks. area-of-a-circle-word-problem-1. Below is a worksheet on the above concept. Print it as well and check if you have understood how to find the.

Whoops! There was a problem previewing Area Circle Word Problems Worksheet.pdf. Retrying Area and Circumference Of A Circle Worksheet with Geometry. For many students, learning the area and circumference of a circle helps them keep track of their homework. With the workbook, they can mark the area that they are working on, which can help them remember what they were doing for a certain time period FINDING THE AREA AND CIRCUMFERENCE OF A CIRCLE WORKSHEET. Problem 1 : An irrigation sprinkler waters a circular region with a radius of 14 feet. Find the circumference of the region watered by the sprinkler. Use 22/7 for π. Problem 2 : The diameter of a car wheel is 21 inches. Find the circumference of the wheel

Printable PDF KS3 and KS4 Circles Worksheets with Answers. Learning the ins and outs of circles is an important part of maths for your child or student. That is why Cazoom Maths have supplied you with all the relevant worksheets and answers. Everything from area and circumference, radius, angles and tangents are provided for all abilities to. May 5, 2014 - Circumference of a Circle worksheets | 7th Grade Standard Met: Circumference. May 5, 2014 - Circumference of a Circle worksheets | 7th Grade Standard Met: Circumference. Pinterest. Today. Explore. When autocomplete results are available use up and down arrows to review and enter to select. Touch device users, explore by touch or.

Geometry worksheet: Circumference, Area, &

Diameter Circumference And Radius Year 8. Diameter Circumference And Radius Year 8 - Displaying top 8 worksheets found for this concept.. Some of the worksheets for this concept are Diameter radius and circumference work, Area and circumference of a circle work grade 8, 16 circles and cylinders mep y8 practice book b, Circle, Radius diameter circumference area booklet super, 11 circumference. Read PDF Area Of A Circle Word Problems With Solutions This area of a circle word problems with solutions, as one of the Circumference and Area of a Circle Worksheets This page is a one-stop shop for all your finding area and circumference of a circle exercises. Catering to the learning needs of students in grade

Printable math worksheets circumferenc

  1. 21) area = 201.1 in.2 22) area = 78.5 ft.2 Find the circumference of each circle. 23) area = 64π mi.2 24) area = 16π in.2 Find the area of each. 25) circumference = 6π yd. 26) circumference = 22π in. 27) Find the radius of a circle so the are and the circumference are the same
  2. Area and circumference of a circle worksheet math aids This Circle Worksheet is great for practicing solving for the circumference, area, radius and diameter of a circle. The worksheet will produce 9 problems per page. This worksheet is a great resources for the 5th, 6th Grade, 7th Grade, and 8th Grade
  3. A good way to quickly estimate the circumference and area of a circle is to round Pi off to the whole number '3' (instead of using two decimal digits like 3.14). Use Pi = 3 to estimate the circumference and area of each of the circles below. Estimating Circumference and Area. CCA 1. 1 5 m 2 1 in. 4 4 ft 3 2 cm. 6 6 yd 5 10 m. C = π x d
  4. 23) area = 254.5 in² 24) area = 314.2 in² Find the circumference of each circle. 25) area = 64 π mi² 26) area = 16 π in² Find the area of each. 27) circumference = 6π yd 28) circumference = 22 π in Critical thinking question: 29) Find the radius of a circle so that its area and circumference have the same value.-2
  5. Solutions: Worksheet 2.1 6. r =1.5 units, Circumference = 9.42 units 7. r = 2 units, Circumference = 12.56 units 8. r = 10 units, Circumference = 62.8 unit
  6. Finding Circumference from Area | Worksheet #2. Task grade 7 and grade 8 students with finding the circumference given the area. This pdf area and circumference worksheet contains circles with an area of four or five digits, so the mighty math wizards are up against an exciting challenge

Section 6.1 Circles and Circumference 241 Circumference of a Circle Words The circumference C of a circle is equal to π times the diameter d or π times twice the radius r. Algebra C = π d or C =π 2r EXAMPLE 2 Finding Circumferences of Circles a. Find the circumference of the fl ying disc. Use 3.14 for . C = 2π r Write formula for. Area and circumference of a circle word problems worksheet tes Immatriculations et radiations des sociétés en France ( source : OpenData Infogreffe ) Tous les graphiques sont générés avec les données mises à disposition par InfoGreffe en OpenData A worksheet where you need to find the area and circumference of a set of circles. Choose if you want the problems to be in metric units or imperial units. Choose if you want the radius or diameter to be given in the problems (or a mix of both) Give an informal argument for the formulas for the circumference of a circle, area of a circle, volume of a cylinder, pyramid, and cone. Use dissection arguments, Cavalieri's principle, and informal limit arguments. WORKSHEETS: Regents-Circumference GEO/A/B: 2/5/1: TST PDF DOC TNS: Regents-Area of Circles A/B: 4/2: TST PDF DOC TNS: Regents.

Grade 6 math worksheet - Geometry: area and circumferenceCircumference and Area of Circle Worksheets | Circle

Area Of A Circle Questions Workshee

Circumference and Area of a Circle Worksheet. Tags: 6th Grade 7th Grade. Download PDF. Download PDF Area of Circles Worksheet 5 - Here is a nine problem worksheet that will allow your students to practice calculating the area of a circle. Each exercise provides a drawing of the circle as well as the length of either the radius or the diameter. Area of Circles Worksheet 5 RTF. Area of Circles Worksheet 5 PDF 2 What is the circumference of a circle with a diameter of 9 meters? C = π d 3 If the diameter of a circle is 25 cm, what is the circle's circumference? C = π d 7 If the radius of a circle is 4 meters, then the circumference is _____. C = π d 8 If r = 3 in., then A = _____ sq. in. A = πr² Area & Circumference of Circles Math F 8 cm 12 cm. exam questions, especially those where you are asked to calculate the area and circumference of a circle. Parts of a Circle Definition Arc A part of the circumference of the circle. Chord A straight line that joins two points on the circumference of a circle. Circumference The distance around the outside of the circle Calculate the mea of the semi-circle rounded off to two decimal places Solution The radius is 6 m. Area of semi-circle is: [(36Tt)] (1811) 56,55m2 16m Example 3 (a) Calculate the area of the circle rounded off to two decimal places Solution 24 cm The diameter is 24 cm. Therefore the radius is 12 cm. Area of circle is: A = (14471) — 452,39 cm

Circumference of Circles Worksheets Download PDFs for Fre

24. Find the area of the shaded region. 25. Find the area of the shaded region. Area, Perimeter and Circumference Review WS B. Use the figure below to answer questions 22 and 23. 22. What is the perimeter of this compound figure? 23. What is the area of this compound figure? 24. Find the area of the shaded region. 25. Find the area of the. About This Worksheet: We mix up providing the radius and diameter to make sure that students will focus on the nature of the equation. How Long?: 8 - 10 minutes. 7th Grade Standard Met: Circumference Circle This generator makes worksheets for calculating the radius, diameter, circumference, or area of a circle, when one of those is given (either radius, diameter, circumference, or area is given). They can be made in PDF or html formats Ready to Print Circumference of a Circle and Area of a Circle Worksheets. Designed to supplement our Circumference and Area of Circles lessons. Be sure to also try our fun interactive Circumference and String game Area of a Circle Worksheets. Worksheet 1 Worksheet 2 Worksheet 3 Worksheet 4. Remember. The circumference is the. distance around a circle. Circumference Formula: If you know the radius

Circumference and area of circle worksheets this page is a one stop shop for all your finding area and circumference of a circle exercises. Area and perimeter word problems worksheet 2 area and perimeter word problems these are multi step problems. If the picture below is the playground how much fencing needs to go up to keep the kids in the. Area of a sector of a circle worksheet pdf (8 Worksheets) Area and Circumference of Circle This page contains around 100 worksheets based on area and circumference of a circle to provide the much-needed practice for children in grade 5 through grade 8. Each type comes up with three difficulty levels

Circumference and Area of Circle Worksheets

Grade 5 Geometry Worksheets: Circumference of circles K5

5.9 The student will identify and describe the diameter, radius, chord, and circumference of a circle. 6.10 The student will . a) define π (pi) as the ratio of the circumference of a circle to its diameter; b) solve practical problems involving circumference and area of a circle, given the diameter or radius; Table of Content The Area and Circumference of a Circle Worksheet are quite comfortable to use and is available for free. Students can simply solve the various questions available in the Circumference and Area Word Problems Worksheet and learn how to solve problems on the same. To know many other mensuration topic worksheets, stay in touch with our site Build a snowman, track the caterpillar, and engage in a lot of interesting activities with circles! (8 sheets) Area and circumference of the circle This page contains about 100 working sheets based on the area and circumference of the circle to provide much-needed practice for children in grade 5 to class 8. Each type has three difficulty levels Circumference Word Problems For each problem, you are expected to complete all of the following: 1. Draw a diagram of a circle and label all given information 2. Write the formula that you will use (e.g. ! C=2r) 3. Solve for the exact answer (i.e. in terms of ! ) and BOX this answer 4

Grade 5 Geometry Worksheets: Area of circles K5 Learnin

Solutions: Worksheet 3.1 9. 10. 1. r = 14 units, Area = 615.44 square units 2. r = 3.5 units, Area = 38.47 square units 3. r = 4.5 units, Area = 63.59 square unit Students can use math worksheets to master a math skill through practice, in a study group or for peer tutoring. Use the buttons below to print, open, or download the PDF version of the Calculate Circumference and Area of Circles (A) math worksheet. The size of the PDF file is 32083 bytes. Preview images of the first and second (if there is one. Worksheet 3 - Area of a Segment A segment of a circle is part of a circle cut off by a chord. 1. Calculate the area of each of the shaded segments: (a) (b) (c) (d) 2. Calculate the area of the shaded part. Give your answer correct to 1 d.p. 6 cm 5 cm 8 cm 150° 3 cm 12 cm 5 cm 36 Monthly Archives Page Grade Measurement Worksheets Counting Free Printable Writing Numbers 1 Central Inscribed Angles Worksheet Measuring Length Circumference Area Circle. Year 6 Circumference Quadrants Worksheet Circle Worksheets. Photos Tagged Circumference Circle Worksheets. Area Circle Worksheet Senior Stem Teacher Circumference Worksheets Area And Circumference Circle Worksheet Free Area And Circumference Of A Circle printable Math worksheets for 5th Grade students. Click on the image to view or download the PDF version

Area and Circumference of a Circle worksheet PDF | Circles

Perimeter circumference and area worksheet You are here: Home → Spreadsheet → Circle This generator makes spreadsheets for calculating the radius, diameter, circumference, or area of a circle when one of these is given (either radius, diameter, circumference, or area is specified). They can be done in PDF or html formats Circumference Of Circle Worded Problems. Displaying top 8 worksheets found for - Circumference Of Circle Worded Problems. Some of the worksheets for this concept are Circle area and perimeter word problems, Finding the circumference of a circle, Even more area and perimeter word problems question, 11 3 circles and circumference, Mathematics linear 1ma0 area circumference of circles, Circle. Area of circles and triangles. Submitted by Ian Saunders on 24 September 2009. Area of circles and triangles provides straightforward but very useful practice with working with formulae and using Pi. 2 pages plus answer sheet The perimeter of a circle is referred to as the circumference. Circle shape worksheet for preschools. We use formulae to calculate area. This assemblage of calculating the area of compound or composite shapes worksheets designed for students of 3rd grade through 8th grade includes rectilinear shapes rectangular paths or l shapes and two levels. Just take a square and make a mark every square inch on the circle. In order to figure out the area and circumference of a circle, you will need to take the square inches that you marked and divide them by the diameter of the circle. Area and Circumference Of A Circle Worksheet Answers Also Summer Math Day 14 July 10th Review and Homework The circumference is the distance around the outside, so its units are the same as those of the diameter. b) The formula for area is π r 2 \pi r^2 π r 2, so firstly we have to get the radius by halving the diameter: r = 8. 4 ÷ 2 = 4. 2 r=8.4\div 2=4.2 r = 8. 4 ÷ 2 = 4. 2. Then we get