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Triangles: Classification

A triangle is a polygon with three sides.

Triangles can be classified by side length or by angle measure .

Classification by Side Length
Equilateral Triangle All sides congruent Math diagram
Isosceles Triangle At least two sides congruent Math diagram
Scalene Triangle No sides congruent Math diagram


Classification by Angle Measure
Acute Triangle All interior angles measure less than 90 ° Math diagram
Right Triangle Exactly one interior angle measures 90 ° Math diagram
Obtuse Triangle Exactly one interior angle measures more than 90 ° Math diagram


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