Question

question 20/25
find the measure of the exterior angle in the following triangle.
20
a 125°
b 100°
c 135°
d 130°

Explanation:

Step1: Recall exterior - angle property

The measure of an exterior angle of a triangle is equal to the sum of the measures of the two non - adjacent interior angles.

Step2: Identify non - adjacent interior angles

The non - adjacent interior angles to the exterior angle at B are $\angle A = 35^{\circ}$ and $\angle C=90^{\circ}$.

Step3: Calculate the exterior angle

$x=\angle A+\angle C = 35^{\circ}+90^{\circ}=125^{\circ}$

Answer:

A. $125^{\circ}$