### Home > CCA2 > Chapter 12 > Lesson 12.2.2 > Problem 12-120

12-120.

If the side lengths of *∆ABC* are *a* = 9, *b* = 10, and *c* = 5, calculate the measure of the largest angle. Homework Help ✎

Start by drawing a triangle and labeling the sides and angles.

Use the Law of Cosines, then Law of Sines to calculate the measures of the angles.

Which angle is the largest?