# 8.8: Triangle Classification

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Acute Triangle

Acute Triangle

An acute triangle has three angles that each measure less than 90 degrees.Congruent

Congruent

Congruent figures are identical in size, shape and measure.Exterior angles

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

Interior angles are the angles inside a figure.Isosceles Triangle

Isosceles Triangle

An isosceles triangle is a triangle in which exactly two sides are the same length.Obtuse Triangle

Obtuse Triangle

An obtuse triangle is a triangle with one angle that is greater than 90 degrees.Right Angle

Right Angle

A right angle is an angle equal to 90 degrees.Scalene Triangle

Scalene Triangle

A scalene triangle is a triangle in which all three sides are different lengths.Triangle

Triangle

A triangle is a polygon with three sides and three angles.Equilateral

Equilateral

A polygon is equilateral if all of its sides are the same length.Equiangular

Equiangular

A polygon is equiangular if all angles are the same measure.### Image Attributions

## Description

Classify triangles by side lengths and angle measures

## Learning Objectives

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## Date Created:

Dec 21, 2012## Last Modified:

May 09, 2015## Vocabulary

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