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

8-105.

For ΔABC, determine mC given that BC = 30, AC = 15, and AB = 21. Homework Help ✎

Use the Law of Cosines:
c2 = a2 + b2 − 2ab(cosC)

mC ≈ 40.5°