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Book VI   Proposition 26
Siince, then,
    ABCD is about the same diameter with KG,
therefore,
    as DA is to AB,
    so is GA to AK. [VI.24]

But also,
    because of the similarity of ABCD, EG,
    as DA is to AB,
    so is GA to AE;
therefore also,
    as GA is to AK, so is GA to AE. [V.11]
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