Question

If triangle ABC has the following measurements, find the measure of side c: a = 9 b = 12 C = 64°

A) 18.61
B) 11.42
C) 17.88
D) 5.56

Answer 1

B) 11.42

Explanation:

Using the Law of Cosines:

`c=√(a^2+b^2-2ab \cos C)=\sqrt{9^2+12^2-2(9)(12)\cos 64^(\circ)} \approx 11.42`