If we were to take QD and RE closer to MC, the former area would be still greater.
If QD is the bounding ordinate of one of the component strips, we can calculate the area of Qdbl in the ordinary way.
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The data for the area ADQ are a series of values of u corresponding to equidifferent values of x; if we denote by y the distance of a point on the arc AD from QD, we can from the series of values of u construct a series of values of y corresponding to equidifferent values of u, and thus find the area of ADQ, treating QD as the base.
