00:01
Finding the area of a regular pentagon.
00:04
So pentagon has five sides.
00:06
And it's inscribed in a circle with a radius of 12.
00:08
So your radius goes to each vertices.
00:11
So we know this is 12.
00:13
And we can form a right triangle because the area is a pothum times perimeter divided by two, which we don't know a pothub and we don't know perimeter.
00:24
So we got to find both of those to find our angle inside here.
00:31
We have to find all of these angles.
00:33
And again, since it's regular, we know all of them are concurrent.
00:36
And to do that, we do n -2 times 180 divided by n.
00:43
So you plug in 5...