Question

given a triangle with the side b=60m, angleB=51.3deg. and side a= 76.45m, find angle C?
a) 37.78deg.
b) 97.43deg.
c) 99.44deg.
d) 44.8deg.

Answer 1

use the cosin theorem

Answer 2

Use the Law of Sines:

\[\frac{\sin(51.3)}{60}=\frac{\sin(A)}{76.45}\]Once you find A, you have two angles and you can subtract their sum from 180 to find C.

Answer 3

on the other hand law of sines would be much faster =)

Answer 4

Maybe...I don't even remember the cosin theorem :P