A triangle with one right angle.

A triangle with one obtuse angle.

A triangle with all three angles acute.

A triangle with no sides equal in length.

A triangle with two sides equal in length.

A triangle with all three sides equal in length.

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Triangles

List of triangle classifications

Term	Definition
Right triangle	A triangle with one right angle.
Obtuse triangle	A triangle with one obtuse angle.
Acute triangle	A triangle with all three angles acute.
Scalene triangle	A triangle with no sides equal in length.
Isosceles triangle	A triangle with two sides equal in length.
Equilateral triangle	A triangle with all three sides equal in length.