Triangles can be classified by their angles and/or side lengths. Use the chart below to help you name triangles.

Classify by the lengths of their sides |
Classify by the measures of their angles |

Equilateral has 3 congruent sides |
A Right triangle has 1 right angle |

Isosceles has 2 congruent sides |
An Acute triangle has 3 acute angles |

Scalene has no congruent sides |
An Obtuse triangle has 1 obtuse angle |

Hint:

right angle = exactly 90º

acute angle = more than 0º but less than 90º

obtuse angle = more than 90º but less than 180º

straight angle = exactly 180º

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