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To solve for r, you just need to isolate r. To do that, divide by h and π on both sides:
Then, square root both sides to get rid of the 'squared':
Or, if you wanted the answer in terms of π, then just don't divide by it, just divide by h and then square root it.
Then, square root both sides to get rid of the 'squared':
Or, if you wanted the answer in terms of π, then just don't divide by it, just divide by h and then square root it.