Suppose a triangle has two sides of length 3 and 4 and that the angle between these two sides is 60°. What is the length of the third side of the triangle?

A. square root of 13
B. square root of 3
C. 4 square root of 3
D. 3

Question

Suppose a triangle has two sides of length 3 and 4 and that the angle between these two sides is 60°. What is the length of the third side of the triangle?

 		A.	square root of 13
 		B.	square root of 3
 		C.	4 square root of 3
 		D.	3

anonymous · Answer

Will Medal! :) Need AS SOON AS POSSIBLE PLEASEEEEE

mackenzie2013 · Answer

use the cosine rule 
c^2 = a^2 + b^2 - 2ab cos C

anonymous · Answer

Thanks, the answer is A :D