Exterior Angle Theorem Worksheet for Grade 8 Geometry

This resource was developed to partially meet the requirements of the 8th Grade Geometry standard below:

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

*This resources ONLY explores the bold portion of the standard above.

It contains the following resources:

1) Naming Angles by Three Vertices Practice [Optional; not necessary for all learners]

2) Hands-On Introduction to Exterior Angles of Triangles [Optional; not necessary for all learners]

3) Exterior Angles of Triangles NOTES

4) 10 Practice Questions based on notes

5) 10 Question Quiz in both hard copy and Google Forms formats

6) Answer key to all parts