For consistency, you can choose whether the boxes should hit the curve on the left hand corner, the right hand corner, the maximum value, or the minimum value. To calculate the Riemann Sum (area under...For consistency, you can choose whether the boxes should hit the curve on the left hand corner, the right hand corner, the maximum value, or the minimum value. To calculate the Riemann Sum (area under the curve) between 1 and 9 of the function, first draw the graph and the boxes. The area for each of the rest of the boxes is 2 times the height of the function evaluated at 5, 7 and 9.