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Book II   Proposition 14
But, if not, one of the straight lines BE, ED is greater.

    Let BE be greater,
and
    let it be produced to F;
    let EF be made equal to ED,
and
    let BF be bisected at G.

With center G and distance one of the straight lines GB, BF
    let the semicircle BHF be described;
    let DE be produced to H,
and
    let GH be joined.
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