A scalene triangle has no sides equal and no angles equal.

An isosceles triangle has two sides equal and also two angles equal.

An equilateral triangle has three equal sides and all three angles equal 60°.

A right-angled triangle is one in which one angle is 90°.

Examples:

Note that equal sides are marked by small dashes.

Scalene	Isosceles	Equilateral	Right-angled