isosceles triangle

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isosceles triangle (plural isosceles triangles)

  1. (geometry) A triangle having at least two sides equal.

Usage notes[edit]

In original usage, an isosceles triangle was understood to have the third side unequal to the other two, that is, an isosceles triangle has exactly two equal sides. An equilateral triangle is, however, a special case of an isosceles triangle, having all three sided equal.