00:01
So in this problem, we're being asked to take the given of formula that's used to find the surface area of a cylinder, and we want to rearrange it to get h all by itself.
00:09
So you want to think about solving for h just like you would a regular equation.
00:14
So the first thing you want to determine is, well, where is your h in this equation? and it's a part of this first term.
00:20
So in this first term, h is getting multiplied by 2 pi r.
00:24
Well, what else is happening to h? then we would be adding 2 pi r squared to it.
00:29
So the first thing i'm going to move is this term that doesn't have the age in it.
00:34
Well, to move 2 pi r squared to the left hand side, i'm going to go ahead and subtract it.
00:42
And again, we can do this because 2 pi r squared divided by 2 pi r squared is equal to 0.
00:48
So these two terms will cancel up.
00:50
Now, on the left hand side, those are not like terms...