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AB be bisected at the point E, one of the sides of traingle ABC,
and
on EB let EBFG be described similar and similarly situated to D; [VI.18]
let the parallelogram AG be completed.
If, then
AG is equal to C, that which was enjoined will have been done;
for,
there has been applied to the given straight line AB the parallelogram AG equal to the given rectilineal figure C
and
deficient by a parallelogramic figure GB which is similar to D.
