T
H
E

E
L
E
M
E
N
T
S		 Book II   Proposition 11
For
    let the square ABDC be described on AB; [I.46]

    let AC be bisected at the point E,
and
    let BE be joined;

    let CA be drawn through to F,
and
    let EF be made equal to BE;

    let the square FH be described on AF,
and
    let GH be drawn through to K.
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