### Home > A2C > Chapter 13 > Lesson 13.2.2 > Problem13-120

13-120.

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?