T
H
E

E
L
E
M
E
N
T
S
Book VI   Proposition 9
    Let a straight line AC be drawn through from A containing with AB any angle;
    let a point D be taken at random on AC,
and
    let DE, EC be made equal to AD. [I.3]

    Let BC be joined,
and through D
    let DF be drawn parallel to it. [I.31]

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