Area of a circle, and of parts of a circle

Answer Key - Grade 7 Math Worksheet

Circle the best answer, or write your answer on the line.

1. 1.

   Luz's button has a radius of 1.2 cm. It is very small and very round. What is its area in square cm? Use π = 3.14. Do not round.

   4.5216
2. 2.

   Milo's plate has a radius of 8.5 cm. It has been spinning on a finger. What is its area in square cm? Use π = 3.14. Do not round.

   226.865
3. 3.

   Ren's pizza has a diameter of 29 cm. It has strong opinions about toppings. What is its area in square cm? Use π = 3.14. Do not round.

   660.185
4. 4.

   Tala's dish has a diameter of 31 cm. It is a very big dish. What is its area in square cm? Use π = 3.14. Do not round.

   754.385
5. 5.

   Zee's flower bed has a diameter of 10 m. The petals are in a circle. What is its area in terms of π? Write it like 14π.

   25π
6. 6.

   Bo's dish has a radius of 6.5 cm. It is a roomy dish. What is its area in terms of π? Write it like 14π.

   42.25π
7. 7.

   Jun's plate has a diameter of 24 cm. It is a very serious plate. Which expression gives its area? Use π = 3.14. Do not round.

   • 3.14 × 12 × 12
   • 3.14 × 12
   • 3.14 × 24 × 24
   • 3.14 × 24
8. 8.

   Kira's pizza has a radius of 13 cm. It is waiting for its close-up. Which expression gives its area? Use π = 3.14. Do not round.

   • 3.14 × 26 × 26
   • 2 × 3.14 × 13
   • 3.14 × 13 × 13
   • 3.14 × 13
9. 9.

   Luz's pizza has a radius of 16 cm and is cut into 8 equal slices. What is the area of one slice in square cm? Use π = 3.14. Do not round.

   100.48
10. 10.

    Pia's pizza has a radius of 15 cm and is cut into 10 equal slices. What is the area of one slice in square cm? Use π = 3.14. Do not round.

    70.65