T
H
E

E
L
E
M
E
N
T
S
Book VI   Proposition 33
But,
    as the angle BGC is to the angle EHF,
    so is the angle BAC, to the angle EDF;
for
    they are doubles respectively.

Therefore also,
    as the circumference BC is to the circumference EF,
    so is the angle BGC to the angle EHF,
and
    the angle BAC to the angle EDF.
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