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 all three sides and all three angles equal to 60°.

A __right-angled triangle__ is one in which one angle is 90°.

__ Examples__:

Scalene | Isosceles | Equilateral | Right angle |

Note that equal sides are marked by small dashes.