Help me I have no idea how to solve!

*****For this problem, I substituted pi, with x, because I cannot find the pi button :/ sorry if it gets confusing... :(
V = xr²h + r²h //solve for h
Factor out the h
V = (xr² + r²) h
divide by xr²+r²
V / xr² + r² = h
Hope this helped! :D