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AB be be the given straight line, C the given rectilineal figure to which the figure to be applied to AB is required to be equal, not being greater than the parallelogram described on the half of AB and similar to the defect, and D the parallelogram to which the defect is required to be similar;
thus
it is required to apply to the given straight line AB a parallelogram equal to the given rectilineal figure C
and
deficient by a parallelogrammic figure which is similar to D.
