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Year 9 maths · N.11 · Volume of cylinders, cones and spheres

Find the radius of a cylinder from its volume

Work backwards from the volume formula to find the missing length.

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  1. A cylinder has a volume of 2009.6 cm³ and a height of 10 cm. Use π = 3.14. What is its radius, in cm?

    Answer: 8

  2. A cylinder has a volume of 863.5 cm³ and a height of 11 cm. Use π = 3.14. What is its radius, in cm?

    Answer: 5

  3. A cylinder has a volume of 310.86 cm³ and a height of 11 cm. Use π = 3.14. What is its radius, in cm?

    Answer: 3

Tip: Work backwards from the volume formula to find the missing length.

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