Distance around a circle

Answer Key - Grade 7 Math Worksheet

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

1. 1.

   Jun's plate has a diameter of 27 cm. It has a very smooth rim. What is its circumference in cm? Use π = 3.14. Do not round.

   84.78
2. 2.

   Pia's flower bed has a radius of 6.5 m. The tulips are in a circle. What is its circumference in meters? Use π = 3.14. Do not round.

   40.82
3. 3.

   Tala's pizza has a radius of 8.5 cm. It is a personal pizza with big plans. What is its circumference in cm? Use π = 3.14. Do not round.

   53.38
4. 4.

   Zee measures a round plate: 44 cm around and 14 cm across. The tape measure had a busy day. What is the circumference divided by the diameter, to the nearest hundredth?

   3.14
5. 5.

   Ari measures a round cookie: 15.6 cm around and 5 cm across. It was measured before it was eaten. What is the circumference divided by the diameter, to the nearest hundredth?

   3.12
6. 6.

   Esme measures a round cookie: 22 cm around and a radius of 3.5 cm. A crumb fell off. Just one. What is the circumference divided by the diameter, to the nearest hundredth?

   3.14
7. 7.

   Jun's flower bed has a diameter of 12 m. The flowers are showing off. What is its circumference in terms of π? Write it like 14π.

   12π
8. 8.

   Milo's hand mirror has a diameter of 13.5 cm. It is a very big hand mirror. Which expression gives its circumference? Use π = 3.14. Do not round.

   • 2 × 3.14 × 13.5
   • 3.14 × 13.5
   • 3.14 × 13.5 × 13.5
   • 3.14 × 6.75
9. 9.

   Noah's pizza has a radius of 9.5 cm. It has a lot of crust to measure. Which expression gives its circumference? Use π = 3.14. Do not round.

   • 3.14 × 9.5 × 9.5
   • 2 × 3.14 × 9.5
   • 3.14 × 9.5
   • 2 × 3.14 × 19
10. 10.

    Pia's plate has a diameter of 16.5 cm. It would like to be a frisbee. Which expression gives its circumference? Use π = 3.14. Do not round.

    • 3.14 × 8.25
    • 3.14 × 16.5
    • 2 × 3.14 × 16.5
    • 3.14 × 16.5 × 16.5