00:01
Okay, so your reason number one is always given with every proof.
00:04
So reason number one, given.
00:07
Reason number two, the measure of angle jkm, which is this angle and the measure of mkl are congruent.
00:16
Why? well, that's going to be your definition of bisect.
00:25
Because it tells you that they bisect each other.
00:28
Now, your next one says these two angles added together equal your whole thing.
00:34
That's your angle addition postulate.
00:46
Okay.
00:50
Now we're going to use substitution because you're substituting in what you know, because you know that these two are congruent, so i can substitute jkm for mkl because i know that those two are congruent.
01:08
So that's your substitution property.
01:18
And then next is i want to say combining like terms simplifying.
01:26
You're just simplifying.
01:27
Combining like terms, simplifying.
01:30
So simplify.
01:31
Because you have two of those, one, two, make two imp.
01:41
Now six is going to be your division.
01:45
You're going to divide by two on both sides or multiply times one half, which is your division property.
02:03
The next one.
02:07
How do you know that they're perpendicular? you know they're perpendicular because it's given.
02:14
And then number two, how do you know that dbc is a right angle? that's going to be definition of perpendicular.
02:34
Three, how do you know that it's 90 degrees? well, it's a right angle.
02:39
So that's going to be definition of right angle.
02:53
Now, how do you know that d -e -b plus e -b -c equal this angle? well, you're adding the segments together.
03:06
So that's your segment...