T H E E L E M E N T S |
Book I Proposition 11 | |
Let a point D be taken at random on AC; let CE be made equal to CD; [I.3] on DE let the equilateral triangle DEF be constructed, [I.1] and let FC be joined. I say that the straignt line FC has been drawn at right angles to the given straight line AB from C the given point on it. |
||
Previous Page Return to Propositions Next Page |