# isosceles

1. (of a straight-sided plane figure) having two sides equal: an isosceles triangle; an isosceles trapezoid.

Origin of isosceles 1545–55; Late Latin Greek isoskelḗs with equal legs, equivalent to iso- iso- + skél(os) leg + -ēs adj. suffix Examples from the Web for isosceles Historical Examples of isosceles

• In an isosceles triangle the angles opposite the equal sides are equal.

The Teaching of Geometry

David Eugene Smith

• And equilaterals, and isosceles triangles, and all that, scoffed Neale.

The Corner House Girls on a Tour

Grace Brooks Hill

• So they crept up to the fire in the formation of an isosceles triangle.

Denis Dent

Ernest W. Hornung

• Then ask them if they are equal-legged (isosceles) triangles.

Guide to the Kindergarten and Intermediate Class and Moral Culture of Infancy.

Elizabeth P. Peabody

• That the angles at the base of an isosceles triangle are equal.

A History of Science, Volume 1(of 5)

Henry Smith Williams

• British Dictionary definitions for isosceles isosceles adjective

1. (of a triangle) having two sides of equal length
2. (of a trapezium) having the two nonparallel sides of equal length

Word Origin for isosceles C16: from Late Latin, from Greek isoskelēs, from iso- + skelos leg Word Origin and History for isosceles adj.

“having two equal sides,” 1550s, from Late Latin isosceles, from Greek isoskeles “with equal sides,” from isos “equal” (see iso-) + skelos “leg” (see scalene).

isosceles in Science isosceles [ī-sŏs′ə-lēz′]

1. Of or relating to a geometric figure having at least two sides of equal length.

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