isosceles

adj

1. (not-comparable)Having (at least) two sides of equal length, used especially of a triangle or trapezoid.

   “Upon each exterior side draw an Isosceles Triangle of 480 Fathoms.”

   “A right double pyramid is isosceles when the extremities of the vertex-edge are at the same distance from the plane of the base.”

   “To prepare for the application of his method, Saccheri made use of a figure with which we are already acquainted. This is the isosceles quadrilateral with the two base angles right angles.”

   “The polygon advantageously is an isosceles trapezoid or rectangle with the pivotal connections between the deck or superstructure and four hulls respectively at its corners.”

   “The flowers were stuck inside a flower pot that was shaped like an isosceles polygon with a rectangular "edge."”