Lesson: Angle Sum of a Triangle Mathematics • 8th Grade

In this lesson, we will learn how to find a missing angle in a triangle given the two other angles.

Lesson Video

Q1:

The measures of the base angles of an isosceles triangle are and , and the measure of the vertex angle is . Find the values of and .

Q2:

Find the measure of .

Q3:

Complete the sentence: The measure of a straight angle is the sum of the measures of the interior angles of a triangle.