Quadrilateral with Symmetry
Illustration of a quadrilateral which has two adjacent sides equal and the other two sides equal. It is symmetrical with respect to the diagonal joining the vertices of the angles formed by the equal sides, and the diagonals are perpendicular to each other.
Keywordskite, quadrilateral, four, lines, line, side, straight, Symmetrical, equal sides, 4 sides, axis of symmetry
G.A. Wentworth Plane And Solid Geometry (Boston: Ginn & Company, 1899) 61