Designating a figure, esp. a triangle, with two equal sides.
Of or relating to a geometric figure having at least two sides of equal length.
(geometry) Having two sides of equal length, used especially of an isosceles triangle or isosceles trapezoid.
Origin of isosceles
From Ancient Greek ἰσοσκελής (isoskelēs), from ἴσος (isos, “equal”) + σκέλος (skelos, “leg”); another word of the same root is scalene.
p. 157); (2) the angles at the base of an isosceles triangle are equal (Id.
6, ABC is an isosceles triangle right D FIG.
Take any two arbitrary directions in the plane of the paper, and draw a small isosceles triangle abc, whose sides are perpendicular to the two directions, and consider the equilibrium of a small triangular prism of fluid, of which the triangle is the cross section.
If both places have the same latitude we have to deal with an isosceles triangle, of which two sides and the included angle are given.
Its form is approximately that of an isosceles triangle, with the sharp angle extending into Lower California, W.