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Book VI   Proposition 22
Let
    the four straight lines AB, CD, EF, GH be proportional,
so that,
    as AB is to CD,
    so is EF to GH,
and
    let there be described on AB, CD the similar and similarly situated rectilineal figures KAB, LCD,
and
    on EF, GH the similarly and similarly situated rectilineal figures MF, NH;
I say that,
    as KAB is to LCD,
    so is MF to NH.
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