T
H
E

E
L
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M
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Book VI   Proposition 12
For
    Let two straight lines DE, DF be set out containing any angle EDF;
    let DG be made equal to A,
    GE equal to B
and further
    DH equal to C;

    let GH be joined,
and
    let EF be drawn through E parallel to it. [I.31]

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