### Home > INT2 > Chapter 8 > Lesson 8.3.2 > Problem 8-73

8-73.

For each diagram below, write and solve an equation for

*x*. Homework Help ✎a.

b.

The sum of the interior angles = 180°(*n* − 2).

*x* + *x* + 125º + 90º + 125º = sum from Step 1

Mark the angles that are vertical to the labeled angles. What do you know about the angles that you marked?

*x* = 3º