T
H
E

E
L
E
M
E
N
T
S
Book VI   Proposition 1
For
    let BD be produced in both directions to the points H, L
and
    let BG, GH be made equal to the base BC
and
    any number of straight lines DK, KL equal to the base CD;
    let AG, AH, AK, AL be joined.
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