This lesson focuses on angles in triangles. Students find missing angle measures for vertical, supplementary, corresponding, and alternate interior angles. They then apply the sum of the angle measures of a triangle to equilateral, isosceles, and right triangles. Next, students extend the sum of angle measures of a triangle to quadrilaterals. Lastly, they examine the measure of an exterior angle of a triangle.

Originally released by Learnetic, 2016.