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let AC be bisected at D,
let DB be drawn from the point D at right angles to AC,
and
let AB be joined;
the angle ABD is then greater than, equal to or less than the angle BAD.
First let it be greater;
and on the straight line BA, and at the point A on it,
let the angle BAE be constructed equal to the angle ABD;
let BD be drawn through to E,
and
let EC be joined.
