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Book III   Proposition 26
For
    let BC, EF be joined.

Now, since the circles ABC, DEF are equal,
    their radii are equal.
Thus
    the two straight lines BG, GC are equal to the two straight lines EH, HF; and the angle at G is equal to the angle at H;
therefore
    the base BC is equal to the base EF. [I.4]
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