# Definition:Triangle (Geometry)/Scalene

< Definition:Triangle (Geometry)(Redirected from Definition:Scalene Triangle)

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## Definition

A **scalene triangle** is a triangle in which all three sides are of different lengths.

## Euclid's Definition

In the words of Euclid:

*Of trilateral figures, an***equilateral triangle**is that which has its three sides equal, an**isosceles triangle**that which has two of its sides alone equal, and a**scalene triangle**that which has its three sides unequal.