Approximationg Area under a curve with rectangles To find the area under a curve we approximate the area using rectangles and then use limits to find the area. Example 1 Suppose we want to estimate A = the area under the curve y = 1 - x2, 0 f(xi-1)Ax = f(xO) . Ax + f(x1) . Ax + f(12) . Ax + f(x3) . Ax = . 78/ 1=1 Am Ly = Verify