00:01
We are given that n is the midpoint of ab.
00:05
So if we draw ab and put n in the middle here, we know that a .n.
00:13
Is congruent to m .b.
00:16
And we have to figure out why that is true.
00:19
And we have a couple different options.
00:21
So a was the vertical angle theorem.
00:26
We use a couple shortcuts, b, midpoint theorem.
00:34
C segment addition postulate, d was linear pair, e supplementary angles, and f, none of the above.
00:51
So if we go through these, vertical angles, well, that deals with angles, so that's out.
00:57
Midpoint theorem, well, we talk about midpoint, so that could be it...