### Home > GC > Chapter 7 > Lesson 7.2.5 > Problem 7-84

7-84.

*a* ,

*, and ∡* b

*c*are exterior angles of the triangle below. Find

*m* a,

*m* b, and

*m* c. Then find

*m* a+

*m* b+

*m* c. Homework Help ✎

How do the angles within a triangle relate to each other? How do the exterior angles relate to those within the triangle?