Cylinders: volume problems, including a missing radius or height

Answer Key - Grade 8 Math Worksheet - Building Confidence

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

1. 1.

   Ari's candle is a cylinder with a radius of 2 cm and a height of 9 cm. The figure shows one circle layer. What is its volume in cubic cm?

   113.04
2. 2.

   Jun's can is a cylinder with a radius of 3 cm and a height of 11 cm. The figure shows one circle layer. What is its volume in cubic cm?

   310.86
3. 3.

   Kira's mug is a cylinder with a radius of 5 cm and a height of 7 cm. The figure shows one circle layer. What is its volume in cubic cm?

   549.5
4. 4.

   “Sketch, not to scale:” Luz's can is a cylinder with a radius of 4 cm. It holds 653.12 cubic cm, and one circle layer has an area of 50.24 square cm. How tall is it, in cm?

   13
5. 5.

   Milo's toy drum is a cylinder with a radius of 7 cm. It holds 923.16 cubic cm, and one circle layer has an area of 153.86 square cm. How tall is it, in cm?

   6
6. 6.

   Pia's jar is a cylinder with a radius of 6 cm. It holds 791.28 cubic cm, and one circle layer has an area of 113.04 square cm. How tall is it, in cm?

   7
7. 7.

   Tala's cooking pot is a cylinder. One circle layer has an area of 200.96 square cm, so 3.14 × r × r = 200.96. What is the radius r, in cm?

   8
8. 8.

   Zee's toy drum is a cylinder. One circle layer has an area of 314 square cm, so 3.14 × r × r = 314. What is the radius r, in cm?

   10
9. 9.

   Ari's stockpot is a cylinder. One circle layer has an area of 452.16 square cm, so 3.14 × r × r = 452.16. What is the radius r, in cm?

   12
10. 10.

    Bo's round tin is a cylinder. One circle layer has an area of 254.34 square cm, so 3.14 × r × r = 254.34. What is the radius r, in cm?

    9