00:01
For number 19, we're told about a flowproof.
00:04
You have a picture of a rather large triangle in your book.
00:10
And we're given a few things here.
00:14
So we're given that a -e is congruent to cf.
00:18
We're given that a -b is congruent to c -b.
00:22
And we're given that b -e is congruent b -f.
00:25
And we need to prove that triangles a -f -b and c -e -b are congruent to each other.
00:34
So first up here is from our given.
00:38
We know that line a -b is congruent to line c -b.
00:48
So that's one side down.
00:51
It's congruent to line c -b.
00:54
And that is from our given...