Trapezium
2011-2-7 · The area of a trapezium is equal to the product of the length of the median line by the height of the trapezium, or to half the product of the diagonals by the sine of the angle between them. A trapezium whose lateral sides are equal is called equilateral. Figure: t094020a Comments. In the English literature, a trapezium is also called a trapezoid.