isosceles

[ ahy-sos-uh-leez ]

adjective

1. (of a straight-sided plane figure) having two sides equal:

   an isosceles triangle; an isosceles trapezoid.

isosceles

/ aɪˈsɒsɪˌliːz /

adjective

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

isosceles

/ ī-sŏs′ə-lēz′ /

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

Word History and Origins

Origin of isosceles¹

1545–55; < Late Latin < Greek isoskelḗs with equal legs, equivalent to iso- iso- + skél ( os ) leg + -ēs adj. suffix

Word History and Origins

Origin of isosceles¹

C16: from Late Latin, from Greek isoskelēs, from iso- + skelos leg

Example Sentences

If the distances between any two of these were the same, the entire set could not be anti-isosceles.

From FiveThirtyEight

It’s worth noting that many of these sets were rotations or reflections of each other, meaning if one of them was anti-isosceles then others were as well.

From FiveThirtyEight

Here are examples of the largest non-isosceles sets for the 5×5 grid and the 6×6 grid, which had seven and nine points, respectively.

From FiveThirtyEight

Friend-of-The-Riddler Dean Ballard explored non-isosceles sets in three-dimensional grids.

From FiveThirtyEight

That meant there were four equilateral triangles plus 18 isosceles triangles, or 22 triangles in total.

From FiveThirtyEight

A gaily coloured hat hung from one of the boats, and over each floated a red flag shaped like an isosceles triangle.

From Project Gutenberg

Salvage boat take position at apex isosceles triangle 27.6 degrees with lighthouse and summit hill a mile to the south.

From Project Gutenberg

A narrow channel running from the Dorsolum to the Abdomen in Coleoptera, forming an isosceles triangle reversed.

From Project Gutenberg

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

From Project Gutenberg

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

From Project Gutenberg