Question

a side of the triangle below has been extended to form an exterior angle of 131°. find the value of x.

Explanation:

Step1: Recall exterior - angle property

The exterior angle of a triangle is equal to the sum of the two non - adjacent interior angles. So, $x + 90^{\circ}=131^{\circ}$.

Step2: Solve for $x$

$x=131^{\circ}- 90^{\circ}$.

Answer:

$41$