Math, Mathematics, Science, Numerical Analysis, Integration.
of two parallel sides and h represents distance between 2 parallel sides. So , for a single trapezoid the area is as shown. Now for the total area we just sum over all. The index(r) will run from r = 0 to r = (n-1), where n is the no. of trapezoid or no. of division between x= a and x = b. Hence