00:01
So suppose i have two triangles.
00:02
What do i know about these triangles? well, let's look at the angles here.
00:06
I have one angle, h that's 54, another angle that's 54 is k.
00:11
Okay, what else do i have? i have another angle i that is 67 degrees.
00:16
What other angle is 67 degrees? it's going to be approximately l.
00:20
And then i have a third angle that is 59 degrees, and the other angle that's 59 degrees is m.
00:28
Okay, so since this triangle has 3.
00:31
Angles or at least two that are equal.
00:34
This is similar by angle angle similarity.
00:37
And what i'm saying here is triangle h -i -j is similar to triangle h goes with k because they have the same angle.
00:47
I goes with l because they have the same angle and j goes with m.
00:50
So k -l -m.
00:52
So h -i -j is similar to k -l -m.
00:54
What does this mean? this means my side lengths are proportional, which means i can create a proportion.
01:02
What's a proportion? two fractions that are equal to each other between the two triangles...