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Book III   Proposition 33
First let it be acute, and on the straight line AB, and at the point A,
    let the angle BAD be constructed equal to the angle at C;
therefore the angle BAD is also acute.

    Let AE be drawn at right angles to DA,
    let AB be bisected at F,
    let FG be drawn from the point F at right angles to AB,
and
    let GB be joined.
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