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(of a triangle) having two sides of equal length.

*‘The base angles of an isosceles triangle are equal.’**‘Mathematicians sometimes say that A is an arbitrary isosceles triangle, but all they mean is that A could be any such triangle.’**‘First construct an isosceles triangle whose base angles are double the vertex angle.’**‘This is the ‘alternate’ solution to constructing the isosceles triangle with the base of the square as one side, using only a straightedge.’**‘The base of the wedge is an isosceles right triangle in a vertical plane.’*

**Origin**

Mid 16th century via late Latin from Greek isoskelēs, from isos ‘equal’ + skelos ‘leg’.

**Pronunciation**

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