00:01
Let me not just write down the picture, but also what we're trying to find.
00:07
So they called this angle theta over here.
00:10
Across from that is side length b, which is 6.
00:15
And then the other two actually don't matter, but i'm just going to write it the way it's shown as 8 and 12.
00:21
And anytime you either have side angle side, which is not the case here, but we have side, side, side, the rule is to do the law of cosines.
00:33
The other thing before i proceed is make sure your calculator is in degree mode, which mine already is.
00:39
And they want you to round to one decimal, so that's kind of nice.
00:43
So to figure out that angle, so i'm going to call it theta.
00:47
I'm just using a formula that's already solved for theta.
00:50
It's the inverse cosine.
00:52
And what's really important is the side length that's across from it is written here.
01:00
So across from the angle we're trying to find is 6, and that goes there...