<Dl> <Dd> d = a h a + b (\ displaystyle d = (\ frac (ah) (a + b))) </Dd> </Dl> <Dd> d = a h a + b (\ displaystyle d = (\ frac (ah) (a + b))) </Dd> <P> where a and b are the lengths of the parallel sides AD and BC, and h is the height of the trapezoid . </P> <P> The area of an isosceles (or any) trapezoid is equal to the average of the lengths of the base and top (the parallel sides) times the height . In the adjacent diagram, if we write AD = a, and BC = b, and the height h is the length of a line segment between AD and BC that is perpendicular to them, then the area K is given as follows: </P>

Formula to find the area of isosceles trapezium