Types of quadrilaterals | Elementary shapes
Trapezoid
A quadrilateral with at least one pair of parallel sides is called a trapezoid (/ˈtræpəzɔɪd/) in American and Canadian English. In British and other forms of English, it is called a trapezium (/trəˈpiːziəm/). A trapezoid is necessarily a convex quadrilateral in Euclidean geometry. The parallel sides are called the bases of the trapezoid. The other two sides are called the legs (or the lateral sides) if they are not parallel; otherwise, the trapezoid is a parallelogram, and there are two pairs of bases). A scalene trapezoid is a trapezoid with no sides of equal measure, in contrast with the below. (Wikipedia).
