8.7: Triangle Sum Theorem Difficulty Level: At Grade Created by: CK-12 % Progress MEMORY METER This indicates how strong in your memory this concept is Practice Progress % % Practice Now MEMORY METER This indicates how strong in your memory this concept is Share Add to Library Turn In Read Practice Resources Details Loading... Notes/Highlights Having trouble? Report an issue. Color Highlighted Text Notes Show More Vocabulary Language: English ▼ English Exterior angles An exterior angle is the angle formed by one side of a polygon and the extension of the adjacent side. Interior angles Interior angles are the angles inside a figure. Triangle A triangle is a polygon with three sides and three angles. Triangle Sum Theorem The Triangle Sum Theorem states that the three interior angles of any triangle add up to 180 degrees. Image Attributions Show Hide Details Description Learn about the sum of the angles of triangles. Learning Objectives None Related Materials Understanding the Angle Measures of Triangles Triangle Sum Theorem Triangle Sum Theorem Difficulty Level: At Grade Authors: Jen Kershaw Kimberly Hopkins Tags: exterior angles interior angles MAT.GEO.312.L.3 (1 more) triangles Subjects: mathematics Geometry Concept Nodes: MAT.GEO.312 (Triangle Sum Theorem) Grades: 7 Date Created: Dec 02, 2015 Last Modified: Sep 08, 2016 Vocabulary None Save or share your relevant files like activites, homework and worksheet.To add resources, you must be the owner of the Modality. Click Customize to make your own copy.