Math, Mathematics, Science, Numerical Analysis, Integration.
the area of each trapezoid and adding them will give us total area under the curve. Fig-5: r-th trapezoid of the area approximation, which parallel sides of length f(x_r) and f(x_(r+1)) Now you see we take two point x_r and x_(r+1). For those two points we have two lines parallel two y axis, whose