00:01
There's some important things in this problem.
00:03
Let me just point out the important things.
00:07
So they have to tell you that x, y is parallel to b, c, because then you have congruent angles in here.
00:18
I know some people do different notations in here.
00:21
But what that means then is triangle a, x, y is similar to triangle a, b, c.
00:29
Hopefully i've copied down, gotten the right letters in there.
00:33
And it's by angle -angle similarity.
00:37
So what that means then is the proportion of a -x over a -b must be equal to the proportion from a -y over a -c.
00:50
You might be curious of why am i doing this is because the question then asks, what is a -c? so this is what i'm trying to find.
01:00
So i'm going to let that equal some other variable.
01:02
I don't want any confusion with a -b -c.
01:05
So i'm going to call it z...