Question

suppose a triangle has two sides of length 2 and 3 and that the angle between these two sides is 60 degrees. What is the length of the third side of the triangle?

Answer 1

use the Cosine Rule

c^2 = a^2 + b^2 - 2ab cos C

here we have c = x , a = 2 b = 3 and C = 60 degrees