#Isosceles trapezoid definition free#

Every antiparallelogram has an isosceles trapezoid as its convex hull, and may be formed from the diagonals and non-parallel sides of an isosceles trapezoid. However, if crossings are allowed, the set of symmetric quadrilaterals must be expanded to include also the antiparallelograms, crossed quadrilaterals in which opposite sides have equal length. Isosceles right triangle: The following is an example of a right triangle with two legs (and. One example of the angles of an isosceles acute triangle is 50, 50, and 80. Size of this PNG preview of this SVG file: 214 × 121 pixels. Isosceles acute triangle: An isosceles acute triangle is a triangle in which all three angles are less than 90, and at least two of its angles are equal in measurement.

#Isosceles trapezoid definition free#

The base angles of an isosceles trapezoid are equal in measure.Īny non-self-crossing quadrilateral with exactly one axis of symmetry must be either an isosceles trapezoid or a kite. From Wikimedia Commons, the free media repository. In other words, the bases are parallel and the legs are equal in. Yes, think of an isosceles trapezoid as being composed of a rectangle and two congruent right triangles adjacent to two of the opposite sides. Some sources would qualify this with the exception: 'excluding rectangles.' Two opposite sides are parallel, and the two other sides are of equal length. An isosceles trapezium is a trapezium in which the non-parallel sides are equal in measure. Our minimal definition: Isosceles trapezoid - a trapezoid with congruent base angles. In Euclidean geometry, an isosceles trapezoid is a convex quadrilateral with a line of symmetry bisecting one pair of opposite sides, making it automatically a trapezoid. Freebase (3.00 / 2 votes) Rate this definition: