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S		 Book VI   Proposition 33
    Let ABC, DEF be equal circles,
and
    let the angles BGC, EHF be angles at their centers G, H,
and
    the angles BAC, EDF angles at the circumferences;
I say that,
    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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