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Book VI   Proposition 23
For
    lte them be pleced so that BC is in a straight line with CG;
therefore
    DC is also in a straight line with CE.

Let
    the parallelogram DG be completed;
    let a straight line K be set out,
let it be contrived that,
    as BC is to CG, so is K to L,
and,
    as DC is to CE, so is L to M. [VI.12]
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