00:01
Do this two -column style.
00:05
We've got a statement and a reason.
00:09
So we are given that c is the midpoint.
00:14
I'm going to abbreviate a bit.
00:15
C is midpoint of bd and a .e.
00:23
Now, what does that mean? if c is the midpoint of bd, then b .c is congruent to d.
00:34
Also, if bd is the midpoint, excuse me, c is the midpoint of a .e.
00:39
Then ac is congruent to ce.
00:46
I would say by the definition of midpoint.
00:56
We also have, from the picture, angle acb is congruent to angle ecd.
01:08
I can put it in there.
01:10
Acb congruent to angle ecd.
01:15
That is, i'm just going to say vertical angles are congruent.
01:23
You might have a theorem you have to cite, the vertical angle congruence theorem or might be numbered.
01:27
I'm not sure, but it has to do with the fact of the vertical.
01:31
Which then these triangles would be congruent.
01:38
So that should be our last statement.
01:44
And that is because we have two congruent sides, pairs of corresponding congruent sides, and the included angles.
01:49
That is called side angle side congruence...