A Trapezium is a quadrilateral with one pair of parallel sides. In cases, it is also defined as a plane figure with four sides, no of two which are parallel.
Area of Trapezium = ½×(a + b)×h
a, b = sides, h = height
Perimeter of Trapezium (trapezoid calc: find p) = a + b + c + d
a, b, c, d = sides