Question

How to find angle measures of a triangle with side lengths?

Answer 1

Step 1: Begin by using the cosine rule to find the largest angle.
Step 2: Use the sine rule to find one of the remaining angles.
Step 3: Use the 'sum of internal angles' rule to find the third angle... The sum of the internal angles equals 180º

The sum of the internal angles equals 180º ...

A + B + C = 180º