00:01
And what we need to do is identify the similar triangles here.
00:05
And what i have here is a right triangle, and it has its altitude drawn here.
00:12
And let me adjust this a little bit, put the right angles there.
00:16
And i know it's an altitude because if i start at, say, point h and i go to line segment fg, i hit in such a way, when i start point a.
00:26
And it hit line segment fg in such a way that it makes a right.
00:31
Angle there, even though visually looks nothing like a right angle, but it's labels a right angle, so we'll work with that.
00:38
So this blue line here is the altitude there.
00:43
And what we need to do is identify the similar triangles there.
00:49
And using the right angle similarity theorem, what we can do is identify on the right triangles using that theorem.
01:02
So one thing that we could do here is number the triangles.
01:06
I think this is actually a pretty helpful way to do it.
01:10
We can identify this as one right triangle here, another right triangle down here, since it has a right angle, and this entire thing here, the entire triangle, as triangle three here.
01:23
And the way the theorem works is that all triangles are similar to one another, so we can make various similar statements there...