|Book III Proposition 25|
let AC be bisected at D,
let DB be drawn from the point D at right angles to AC,
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,
let EC be joined.
|Previous Page Return to Propositions Next Page|