00:03
Well, i'm going to first figure out this angle right here.
00:08
So 180 minus 43 tells me that this angle is 137.
00:17
And then i know that.
00:25
Does it tell us anything else? it's 62.
00:29
Oh, okay.
00:30
So if i know this side is 91 and i know this side is 62, i can find the length of this side.
00:37
I know that's not the answer, but that's what i'm going to use to help find the answer.
00:41
So law of cosines, x squared equals 62 squared plus 91 squared minus two times 62 times 91 cosine of 137.
00:57
So i'm just going to type all of this on my calculator and come up with that number.
01:01
So 62 squared plus 91 squared minus 2 times 61 times 91 times 91 times times cosine of 137 is 20 ,244 .488.
01:22
Now, take the square root of that, and that gives you 142 .3.
01:30
So this side is 142 .3...