8.8: Triangle Classification Difficulty Level: At Grade Created by: CK-12 CK-12 Middle School Math Concepts - Grade 7 Geometry % Progress Practice Progress % Practice Now Read Practice Resources Details Loading... Vocabulary Language: English ▼ English Acute Triangle Acute TriangleAn acute triangle has three angles that each measure less than 90 degrees. Congruent CongruentCongruent figures are identical in size, shape and measure. Exterior angles Exterior anglesAn exterior angle is the angle formed by one side of a polygon and the extension of the adjacent side. Interior angles Interior anglesInterior angles are the angles inside a figure. Isosceles Triangle Isosceles TriangleAn isosceles triangle is a triangle in which exactly two sides are the same length. Obtuse Triangle Obtuse TriangleAn obtuse triangle is a triangle with one angle that is greater than 90 degrees. Right Angle Right AngleA right angle is an angle equal to 90 degrees. Scalene Triangle Scalene TriangleA scalene triangle is a triangle in which all three sides are different lengths. Triangle TriangleA triangle is a polygon with three sides and three angles. Equilateral EquilateralA polygon is equilateral if all of its sides are the same length. Equiangular EquiangularA polygon is equiangular if all angles are the same measure. Image Attributions Description Classify triangles by side lengths and angle measures Learning Objectives None Related Materials Triangle Classification Triangles Classifying Triangles Triangle Classification Difficulty Level: At Grade Authors: Jen Kershaw Tags: acute triangle equiangular triangle equilateral triangle (5 more) isosceles triangle MAT.GEO.340.L.3 obtuse triangle right triangle scalene triangle Subjects: mathematics Geometry Concept Nodes: MAT.GEO.340 (Triangle Classification) Grades: 7 Date Created: Dec 21, 2012 Last Modified: May 09, 2015 Vocabulary None You can only attach files to Modality which belong to you If you would like to associate files with this Modality, please make a copy first.