00:01
Okay, so for this problem, it says list all of the angles that we know.
00:05
Exterior angle theorem are smaller than angle 10, including the implied angles.
00:14
So angle 10, including the implied angles of angles 3 and angle 4, then also include angle 3 and angle 4.
00:29
Okay, so for this, we can say that angle 10 and angle plus angle 6, they're supplementary, so they're going to equal 180 degrees.
00:48
Then angles 5, angle 4, and angle 6, oops, plus sign in the wrong spot.
01:04
If you add all of those angles together, you're going to equal 180 degrees because they're inside a triangle...