# 6.5: Classifying Triangles

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**Practice**Triangle Classification

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Acute Triangle

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

Congruent figures are identical in size, shape and measure.Equilateral Triangle

An equilateral triangle is a triangle in which all three sides are the same length.Interior angles

Interior angles are the angles inside a figure.Isosceles Triangle

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

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

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

A right triangle is a triangle with one 90 degree angle.Scalene Triangle

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

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

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

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Learn to classify triangles.

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Date Created:

Jan 23, 2013
Last Modified:

Aug 11, 2016
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