what’s the answer for this ^

To solve for h, you want to isolate the variable h on one side of the equation. The other terms can go on the other side of the equation.
Start by subtracting the term without the variable h from both sides of the equation; this means you will subtract 2[tex]\pi[/tex]r^2 from both sides of the equation.
S - 2[tex]\pi[/tex]r^2 = 2[tex]\pi[/tex]rh
Once you have subtracted the term from both sides, isolate and solve for h by dividing everything that h is "attached to" from both sides of the equation. This means you will divide both sides of the equation by 2[tex]\pi[/tex]r. After doing so, you will be left with your answer.
Your final answer is h = [tex]\frac{S-2\pi r^2 }{2\pi r}[/tex].