I NEED HELP EXPLAINING HOW I GOT MY ANSWER ILL GIVE 100 POINTS PLEASEEE?!?!?

Answer:
Step-by-step explanation:
S = 2πr² + 2πrh
Move 2πr² to the left side of the equation
That's
2πrh = S - 2πr²
Divide both sides by 2πr to make h stand alone
That's
We have the final answer as
Hope this helps you