Grade 8 Mathematics Module 2, Topic C, Lesson 14

Boy in Classroom

Student Outcomes

  • Students know a third informal proof of the angle sum theorem.
  • Students know how to find missing interior and exterior angle measures of triangles and present informal arguments to prove their answer is correct.

Downloadable Resources

Common Core Learning Standards

CCLS State Standard
8.G.5 Use informal arguments to establish facts about the angle sum and exterior angle of triangles,...

Curriculum Map