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Book IV   Proposition 15
    Let the diameter AD of the circle ABCDEF be drawn;

    let the center G of the circle be taken,
and with the center D and distance DG
    let the circle EGCH be described;

    let EG, CG be joined and carried through to the points B, F,
and
    let AB, BC, CD, DE, EF, FA, be joined.
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