Question

find x.
39°
60°
x°
x =

Explanation:

Step1: Use the exterior angle theorem

The exterior angle theorem states that an exterior angle of a triangle is equal to the sum of the two non - adjacent interior angles. Here, \(x\) is an exterior angle of the triangle with non - adjacent interior angles \(39^{\circ}\) and \(60^{\circ}\).
So, \(x = 39+60\)

Answer:

\(x = 99\)