`SA = (2)(3.14)(r^2) + (2)(3.14)rh`
`SA = 6.28r^2 + 6.28rh` Subtract `6.28r^2`
`SA - 6.28r^2 = 6.28rh` Divide both sides by `6.28r`
`(SA-6.28r^2)/(6.28r) = (6.28rh)/(6.28r)`
`h = (SA-6.28r^2)/(6.28r)`
`h = (SA)/(6.28r) - r`
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