What is the diameter of a cone with height 8m and volume 150pi m

I know that the formula is 1/3 * pi * r^2 * h and I know you have to plug everything in but I don't know what to do after that.

1/3 * pi * r^2 * h = 150 pi
d = 2 * √(450/8)
= 15 m

Thanks, when you divide => 150 / (1/3 * 8) = 150 / 8/3 = 450 / 8

I hope that helps.

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