T H E E L E M E N T S |
Book I Proposition 12 | |
For let a point D be taken at random on the other side of the straight line AB, and with center C and distance CD let the circle EFG be described; [Post.3] let the straignt line EG be bisected at H, [I.10] and let the straight lines CG, CH, CE be joined. [Post.1] I say that CH has been drawn perpendicular to the given infinite straight line AB from the given point C which is not on it. |
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