Solving for a missing angle in two different ways ex 7

The video tutorial explains how to find a missing angle in a triangle using the properties of exterior and interior angles. It covers the triangle sum theorem and demonstrates two methods to solve for the missing angle. The tutorial emphasizes the relationship between exterior angles and the sum of opposite interior angles, providing a step-by-step guide to calculate the missing angle using known values.

What is the sum of the angles in a triangle according to the triangle sum theorem?

Describe the process of finding the missing angle using the triangle angle sum theorem.