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You can find the radius of a cylinder if you know the surface area and the height.

SA = (2pi r^2) + (2pi r h)

Plug in values for SA and h and solve for r.

You will have a quadratic equation. The answer will be the positive root.

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8y ago
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8y ago

The answer to any such "how do I find..." question depends on what you do know. If you don't know ANYTHING about the cylinder, you'll have to go ahead and do some measurements on the cylinder!

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Q: How can i find the radius of a cylinder if i don't know the volume?
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