4.1: Concept Map Difficulty Level: At Grade Created by: CK-12 Share Add to Library Turn In Read Resources Details Notes/Highlights Having trouble? Report an issue. Color Highlighted Text Notes Please Sign In to create your own Highlights / Notes Show More Image Attributions Show Hide Details Description No description available here... Authors: CK12 Editor Tags: equilateral triangles Exterior Angles Theorem isosceles triangles (3 more) triangle congruence Triangle Sum Theorem triangles Concept Nodes: MAT (Mathematics) MAT.GEO.812 (Area and Perimeter of Triangles) Grades: 8 , 9 , 10 Date Created: Feb 23, 2012 Last Modified: May 12, 2014 Save or share your relevant files like activites, homework and worksheet.To add resources, you must be the owner of the section. Click Customize to make your own copy.