### Home > CC4 > Chapter 10 > Lesson 10.1.4 > Problem 10-69

10-69.

For each diagram below, solve for

*x*. Explain what angle relationship(s) you used. Homework Help ✎

Review the Math Notes box in section 7.1.2

Since the angles of a triangle add up to 180°, set up an equation using all three angles.

*x* = 60°