Exercise 2 Page 290

Let's analyze the given triangle.

According to the Exterior Angle Theorem, the measure of an exterior angle of a triangle is equal to the sum of the measures of the two nonadjacent interior angles. Let's write an equation applying this theorem. x=46+86 ⇒ x=132 We found that x=132. Therefore, the measure of the exterior angle is 132^(∘).