Volume of cones and spheres

Answer Key - Grade 8 Math Worksheet

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

1. 1.

   Jun's toy volcano is a cone with a radius of 4 cm and a height of 15 cm. What is its volume in cubic cm? Use π = 3.14. Do not round.

   251.2
2. 2.

   Kira's turret roof is a cone with a radius of 6 cm and a height of 10 cm. What is its volume in cubic cm? Use π = 3.14. Do not round.

   376.8
3. 3.

   Luz's castle roof is a cone 6 cm across and 4 cm tall. What is its volume in terms of π? Write it like 14π.

   12π
4. 4.

   Pia's ball has a radius of 7.5 cm. What is its volume in cubic cm? Use π = 3.14. Do not round.

   1766.25
5. 5.

   Tala's play ball has a radius of 10.5 cm. What is its volume in cubic cm? Use π = 3.14. Do not round.

   4846.59
6. 6.

   Zee's ball is 6 cm across. What is its volume in terms of π? Write it like 14π.

   36π
7. 7.

   Ari's balloon is 12 cm across. What is its volume in terms of π? Write it like 14π.

   288π
8. 8.

   Bo's snowman head is 18 cm across. What is its volume in terms of π? Write it like 14π.

   972π
9. 9.

   Jun's castle roof is a cone with a radius of 2 cm and a volume of 62.8 cubic cm. How tall is it, in cm? Use π = 3.14.

   15
10. 10.

    Kira's soil pile is a cone with a radius of 5 ft and a volume of 157 cubic ft. How tall is it, in ft? Use π = 3.14.

    6