### Home > INT3 > Chapter 12 > Lesson 12.2.2 > Problem 12-93

12-93.

If the side lengths of Δ*ABC* are *BC* = 9, *AC* = 10, and *AB* = 5, calculate the measure of the largest angle. Homework Help ✎

The largest angle is opposite the longest side.

Use the Law of Cosines.

*m*∠*B* ≈ 86.17°