T
H
E

E
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M
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Book VI   Proposition 12
Since, then,
    GH has been drawn parallel to EF, one of the sides of the triangle DEF;
therefore
    as DG is to GE,
    so is DH to HF. [VI.2]

But
    DG is equal to A, GE to B, and DH ot C;
therefore
    as A if to B, so is C to HF,

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