00:01
All right, this one says solve for the triangle.
00:05
So what we need to see, let's see, which angle do we need to solve for first? let me think.
00:15
So probably solve for side b, right? so you have b squared equals a squared plus c squared minus 2a, c, cosine of b.
00:29
So that's b squared equals b squared.
00:35
425 squared plus 343 squared minus 2 times 425 times 343 times the cosine of 150 .5.
00:50
So you literally just put all this into the calculator and you get b squared equals.
00:55
So 425 squared plus 343 squared minus 2, parenthesis.
01:06
425, parenthesis, 343, cosine of 150 .5.
01:18
Make sure i'm in degree mode.
01:20
All right, so then i get to b squared equal 552026 .2022 square root.
01:34
So i get to b to equal 742...