Angle Sum of a Triangle and Exterior Angles - Digital and Printable

Looking for a complete no-prep digital lesson on angle sum of a triangle and exterior angles? In this scaffolded lesson, students will learn and practice finding the missing angle measurement of a triangle, and calculate an exterior angle of the same triangle. They will find alternate interior angles, alternate exterior angles, and corresponding angles in two parallel lines intersected by a transversal. As a challenge, students will use their new knowledge to prove the angles of a triangle between 2 parallel lines intersected by 2 transversals add up to 180 degrees.

Teacher Key and Video Instructions included.

Standard: CCSS.8.G.A.5

Also included are a printable foldable for the student notebooks, and a printable worksheet for additional practice.

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