### Home > INT3 > Chapter 8 > Lesson 8.3.1 > Problem 8-105

8-105.

For Δ*ABC*, determine *m*∠*C* given that *BC* = 30, *AC* = 15, and *AB* = 21. Homework Help ✎

Use the Law of Cosines:*c*^{2} = *a*^{2} + *b*^{2} − 2*ab*(cos*C*)

*m*∠*C* ≈ 40.5°

8-105.

For Δ*ABC*, determine *m*∠*C* given that *BC* = 30, *AC* = 15, and *AB* = 21. Homework Help ✎

Use the Law of Cosines:*c*^{2} = *a*^{2} + *b*^{2} − 2*ab*(cos*C*)

*m*∠*C* ≈ 40.5°