Solving equations in two unknowns (r and h) requires two independent equations. Since you have only one equation there is no solution.
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Make r the subject of the formula pi*r2*h = V r = the square root of V/pi*h
h = +11 and/or -11
volume of cylinder = pi r2 h so if h = d, h = 2r so v= pi r2 2r depends on the lengths now just fill in the equation
h=16
63