### Home > A2C > Chapter 7 > Lesson 7.3.1 > Problem7-161

7-161.

Find $m∠C$ in each triangle below.

1. Use the Law of Cosines: $8^{2} = 10^{2} + 12^{2} − 2\left(10\right)\left(12\right) \operatorname{cos} C$

$C ≈ 41.41°$

1. $\text{Remember that tan }C=\frac{\text{opp.}}{\text{adj.}}$