Instructional Activity# Angle Plus Two

Lesson 16. Unit 1. Grade 8 Open Up Resources

Open Up Resources15 min(s)

This Instructional Activity is a part of the Lesson 16, Unit 1, Grade 8. In the previous lesson, students conjectured that the measures of the interior angles of a triangle add up to 180 degrees. The purpose of this activity is to explain this structure in some cases. Students apply 180 degrees rotations to a triangle in order to calculate the sum of its three angles.