A piece of land ABCD earmarked for building sub-county hospital. in meters
(a) Write down the ordinates of curves AB and DC for x = 0, 200, 400, 600, 800, 1000 and 1200.
(b) Use trapezium rule, with 6 strips to estimate the area of the piece of land ABCD, in hectares.
(c) Use mid-ordinate rule with 3 strips to estimate the area of the piece of land in meter, in hectares.
you don't tell anything about the curve, but I assume you know how to find the area of a trapezoid.
So, take a stab at it, and there are lots of Riemann Sum, Trapezoid Rule calculators online to verify your results.