In this video lesson, students will discover the converse of the Triangle Sum Theorem and how to use it to prove angle measures form a triangle. I will also introduce the Triangle Inequality Theorem and model how to use it to prove three side lengths could or could not form a triangle. Student practicie is embedded in the lesson. Exemplar problems are provdided and explained.
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00:00 Introduction
00:34 Converse of the Triangle Sum Theorem
01:27 Student Practice #1 - Is it a Triangle?
02:00 Student Practice #2 - True or False?
02:29 The Triangle Inequality Theorem
03:38 Using the Triangle Inequality Theorem
05:00 Student Practice #3 - True or False?
CCSS.MATH.CONTENT.8.G.A.5
Use informal arguments to establish facts about the angle sum and exterior angle of triangles, about the angles created when parallel lines are cut by a transversal, and the angle-angle criterion for similarity of triangles.
