By Their Sides By Their Angles

Scalene Isosceles

No sides are the same length

At least two sides are the same length

Acute Right Obtuse

Acute triangles have three acute angles

Right triangles have one right angle

Obtuse triangles have one obtuse angle

Right Scalene

Obtuse Isosceles

Acute Scalene

Acute Isosceles

Obtuse Scalene

Right Isosceles

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