One of the mysteries of the English language finally explained.
(of a triangle) having two sides of equal length.
- ‘The base angles of an isosceles triangle are equal.’
- ‘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.’
- ‘First construct an isosceles triangle whose base angles are double the vertex angle.’
- ‘Mathematicians sometimes say that A is an arbitrary isosceles triangle, but all they mean is that A could be any such triangle.’
Mid 16th century: via late Latin from Greek isoskelēs, from isos ‘equal’ + skelos ‘leg’.
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