CPM Homework Help : INT3 Problem 12-93

If the side lengths of $ΔABC$ are $BC = 9, AC = 10$ , and $AB = 5$ , calculate the measure of the largest angle.

Hint 1:

The largest angle is opposite the longest side.

Hint 2:

Use the Law of Cosines.

Answer:

$m∠B\approx86.17^\circ$