00:01
Okay, so this wants us to find the measure of the exterior angle.
00:04
So first i want to go over the formula for that.
00:11
So if you have angle one here, angle two here, and then your exterior angle here, to find that exterior angle, you do angle one plus angle two.
00:26
So let's start with number 15.
00:34
Okay, so it has 75 degrees here, 64 degrees here, and we're going to find this exterior angle here.
00:47
So to find x, we just have to do 64 plus 75, and that equals 139 degrees.
00:59
All right, now we can do 16.
01:06
So this exterior angle is now 2x minus 2 degrees.
01:13
We don't know this angle, and this angle is 45 degrees.
01:18
Okay, so we're going to set up the equation just like the first.
01:21
We're going to have x plus 45, which is our two interior angles, equals our exterior angle of 2x minus 2.
01:32
Okay, let's combine our x's and combine our constants, and that gives us that this angle inside is 47 degrees.
01:54
All right, 17 is like this, the outside angle is 3x plus 6 degrees.
02:03
This interior right here is 24 degrees, and this other interior angle is 2x plus 18...