Circles: circumference and area

Answer Key - Grade 6 Math Worksheet

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

1. 1.

   Pia measures a round pizza with a diameter of 20 cm. What is its circumference (the distance around), in cm? Use π = 3.14.

   62.8
2. 2.

   Ren measures a round tent floor with a diameter of 24 ft. What is its circumference (the distance around), in ft? Use π = 3.14.

   75.36
3. 3.

   Zee measures a beach ball with a diameter of 36 inches. What is the circumference (the distance around the middle), in inches? Use π = 3.14.

   113.04
4. 4.

   Ari measures a round bike wheel with a radius of 13 inches. What is its circumference (the distance around), in inches? Use π = 3.14.

   81.64
5. 5.

   Bo measures a round cake top with a radius of 15 cm. What is its circumference (the distance around), in cm? Use π = 3.14.

   94.2
6. 6.

   Kira measures a round plate with a radius of 11 cm. What is its area, in square cm? Use π = 3.14.

   379.94
7. 7.

   Luz measures a round duck pond with a radius of 17 ft. What is its area, in square ft? Use π = 3.14.

   907.46
8. 8.

   Noah measures a round pizza with a diameter of 28 cm. What is its area, in square cm? Use π = 3.14.

   615.44
9. 9.

   Pia measures a round giant clock face with a diameter of 34 inches. What is its area, in square inches? Use π = 3.14.

   907.46
10. 10.

    Ren measures a round giant cookie with a diameter of 22 cm. What is its area, in square cm? Use π = 3.14.

    379.94