### Home > MC1 > Chapter 8 > Lesson 8.4.1 > Problem 8-109

8-109.

The measures of the angles in a triangle add up to 180 degrees.

40° + 50° + *m* = 180°

90° + *m* = 180°

*m* = 90°

Refer to part (a).

8-109.

The measures of the angles in a triangle add up to 180 degrees.

40° + 50° + *m* = 180°

90° + *m* = 180°

*m* = 90°

Refer to part (a).