Question

Please help! Suppose a triangle has two sides of length 3 and 4 and that the angle between these two sides is pi/3. What is the length of the third side of the triangle?

Answer 1

\[A.\sqrt{13}\] \[B.3\] C\[\sqrt{3}\] D.\[4\sqrt{3}\]

Answer 2

use the law of cosine

Answer 3

x^2 = 3^2 + 4^2 - 2(3)(4)cos(pi/3)
solve for x

(assumed the length of the third side is x)