Circles: circumference and area

Answer Key - Grade 6 Math Worksheet - Building Confidence

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

1. 1.

   Milo measures a round quilt. Its diameter is 8 ft. The radius is half of the diameter. What is the radius, in ft?

   4
2. 2.

   Noah measures a round circus tent floor. Its radius is 14 m. The diameter is twice the radius. What is the diameter, in m?

   28
3. 3.

   Ren measures a round umbrella canopy. Its radius is 6 ft. The diameter is twice the radius. What is the diameter, in ft?

   12
4. 4.

   Zee measures a round cake top with a diameter of 18 cm. The circumference (the distance around a circle) is 3.14 diameters. What is its circumference, in cm? Use π = 3.14.

   56.52
5. 5.

   Ari measures a round duck pond with a diameter of 14 ft. The circumference (the distance around a circle) is 3.14 diameters. What is its circumference, in ft? Use π = 3.14.

   43.96
6. 6.

   Bo measures a round jar lid with a diameter of 16 cm. The circumference (the distance around a circle) is 3.14 diameters. What is its circumference, in cm? Use π = 3.14.

   50.24
7. 7.

   Jun measures a round cookie with a radius of 5 cm. Its area is 3.14 squares, each 5 cm by 5 cm. What is its area, in square cm? Use π = 3.14.

   78.5
8. 8.

   Luz measures a round tabletop with a diameter of 6 ft, so its radius is 3 ft. What is its area, in square ft? Use π = 3.14.

   28.26
9. 9.

   Milo measures a round jar lid with a diameter of 14 cm, so its radius is 7 cm. What is its area, in square cm? Use π = 3.14.

   153.86
10. 10.

    Noah measures a round plate with a diameter of 18 cm, so its radius is 9 cm. What is its area, in square cm? Use π = 3.14.

    254.34