Please help me I'm desperate!

Solve V=(1/3)(pi)h^2(3r-h) for r.

(If you want to see the question better, look at the picture)

Also, please explain how to solve it. (And if you could provide a visual, that would be great.)

Please help me Im desperateSolve V13pih23rh for rIf you want to see the question better look at the pictureAlso please explain how to solve it And if you could class=