### Home > MC1 > Chapter 10 > Lesson 10.2.1 > Problem 10-72

10-72.

Since *m* and 137° are vertical angles, *m* = 137°.

*m* + *k* = 180°

180° − 137° = 43°*k* = 43°

*m* = 137°*k* = 43°

The angles within a triangle add to 180°.

10-72.

Since *m* and 137° are vertical angles, *m* = 137°.

*m* + *k* = 180°

180° − 137° = 43°*k* = 43°

*m* = 137°*k* = 43°

The angles within a triangle add to 180°.