Riemann sums use rectangles to approximate the area beneath a curve. The calculator will approximate the definite integral using the Riemann sum and sample points of your choice: left endpoints, right endpoints, midpoints, and trapezoids. ), and f(4) = 20 Since each area has a width of 1 the total area of the 4 approximating rectangles is 10 + 14. 4A2: Interpreting a Definite Integral as the Limit of a Riemann Sum: 3. net uses a Commercial suffix and it's server(s) are located in N/A with the IP number 104. Riemann Zeta Function mapped from z=a+bi, 0.5