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Isosceles trapezoid
In Euclidean geometry, an isosceles trapezoid (isosceles trapezium in British English) is a convex quadrilateral with a line of symmetry bisecting one pair of opposite sides. It is a special case of a trapezoid. In any isosceles trapezoid two opposite sides (the bases) are parallel, and the two other sides (the legs) are of equal length (properties shared with the parallelogram). The diagonals are also of equal length. The base angles of an isosceles trapezoid are equal in measure (there are in fact two pairs of equal base angles, where one base angle is the supplementary angle of a base angle at the other base).
==Special cases==
Rectangles and squares are usually considered to be special cases of isosceles trapezoids though some sources would exclude them.
Another special case is a ''3-equal side trapezoid'', sometimes known as a ''trilateral trapezoid''〔Michael de Villiers, Hierarchical Quadrilateral Tree ()〕 or a ''trisosceles trapezoid''.〔(isosceles trapezoid )〕 They can also be seen dissected from regular polygons of 5 sides or more as a truncation of 4 sequential vertices.
The isosceles trapezoid is also rarely known as a ''symtra'' because of its symmetry.〔.〕
抄文引用元・出典: フリー百科事典『 ウィキペディア（Wikipedia）』
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