T
H
E

E
L
E
M
E
N
T
S
Book VI   Proposition 18
Therefore, proportionally,
    as FD is to GB,
    so is FE to GH, and ED to HB.
But it was also proved that,
    as FD is to GB,
    so is FC to GA, and CD to AB;
therefore also,
    as FC is to AG,
    so is CD to AB,
and
    FE to GH,
and further
    ED to HB.
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