### Home > CC3 > Chapter 9 > Lesson 9.1.2 > Problem 9-21

9-21.

### Missing problem for Book CC3 => Chapter Ch9 => Lesson 9.1.2 => Problem 9-21

Created from orphaned homework help problem

Angle *y* and the 35° angle are complementary.

*y* = 55°

The sum of the interior angles in a triangle is always 180°.