Circumference of a Circle—Word Problems (A) - Practice

Sep 23, 2026

Upload by Aurelia

Worksheet on finding the circumference and related dimensions of circles using C = πd and C = 2πr with π approximated as 3.14. Includes a Pizza Place themed set of problems with different pizza diameters and radii, asking for circumferences to specified rounding (nearest tenth or hundredth). Also compares total crust rolling for multiple pizzas versus one larger pizza and solves for an approximate diameter given a circumference. An answer key is provided.

LanguageEnglish

CategoryExam

FormatPDF

Pages3

Reading Time8 min

AccessFree to download

The Pizza Place

Problem Set 1

Problem Set 2-4

Answer Key

Name: Circumference of a Circle—Word Problems (A) Remember: C = πd or C = 2πr, where π ≈ 3.14. To find d or r from C: d = C ÷ π and r = C ÷ (2π) . Express answers to the nearest tenth unless told otherwise. Directions: Show all work. Express answers to the nearest tenth unless told otherwise. Use π ≈ 3.14. The Pizza Place 1.) The Pizza Place sells three sizes of round pizzas: a personal pizza with a diameter of 8 inches, a medium pizza with a diameter of 12 inches, and a large pizza with a diameter of 16 inches. Find each of the following: a.) The circumference of the crust of the personal pizza (to the nearest hundredth) . b.) The circumference of the crust of the medium pizza (to the nearest hundredth) . c.) The circumference of the crust of the large pizza (to the nearest hundredth) . Mashup Math LLC | Al[l Rights Reserved | Get More K-12 Math Worksheets at www.mashupmath.com](l Rights Reserved | Get More K-12 Math Worksheets at www.mashupmath.com) 2.) The Pizza Place is creating a giant display pizza with a radius of 18 inches to hang in the window. What is the circumference of the display pizza (to the nearest tenth of an inch)? 3.) A chef is rolling garlic butter around the crust of 3 small pizzas, each with a diameter of 8 inches, and one party-size pizza with a diameter of 26 inches. Which requires more crust rolling—the 3 small pizzas combined or the one party-size pizza? By how much (to the nearest hundredth)? 4.) A circular pizza has a crust with a circumference of approximately 50.24 inches. What is the approximate diameter of the pizza (to the nearest inch)? Mashup Math LLC | Al[l Rights Reserved | Get More K-12 Math Worksheets at www.mashupmath.com](l Rights Reserved | Get More K-12 Math Worksheets at www.mashupmath.com) ANSWER KEY 1. a. ) Personal: C = πd → C = π × 8 ≈ 25.13 in b. ) Medium: C = πd → C = π × 12 ≈ 37.70 in c. ) Large: C = πd → C = π × 16 ≈ 50.27 in 2. C = 2πr → C = 2 × π × 18 = π × 36 ≈ 113.1 in 3. 3 small pizzas: C = π × 8 ≈ 25.13 in each 25.13 × 3 = 75.40 in Party pizza: C = π × 26 ≈ 81.68 in 81.68 − 75.40 = 6.28 in The party-size pizza requires 6.28 more inches of crust rolling. 4. C = π × d → 50.24 = π × d → d = 50.24 ÷ π ≈ 16 in The diameter is approximately 16 inches. Mashup Math LLC | Al[l Rights Reserved | Get More K-12 Math Worksheets at www.mashupmath.com](l Rights Reserved | Get More K-12 Math Worksheets at www.mashupmath.com)

FAQs

What formulas are used to find the circumference of a circle in these problems?

Use C = πd or C = 2πr. The worksheet instructs using π ≈ 3.14.

How are answers rounded for the pizza circumference questions?

Most circumference answers are requested to the nearest hundredth or nearest tenth, depending on the specific problem instructions.

How does the worksheet determine the extra crust rolling for the small pizzas versus the party-size pizza?

It computes the total circumference of three 8-inch diameter pizzas, computes the circumference of the 26-inch party pizza, then subtracts to find the difference (to the nearest hundredth).

If the crust circumference is about 50.24 inches, how do you find the pizza diameter?

Set 50.24 = πd and solve d = 50.24 ÷ π, using π ≈ 3.14, then round to the nearest inch.

Sep 23, 2026

Upload by Aurelia