T H E E L E M E N T S |
Book I Proposition 46 | |
Let AC be drawn at right angles to the straight line AB from the
point A on it, [I.11] and let AD be made equal to AB; through the point D let DE be drawn parallel to AB, and through the point B let BE be drawn parallel to AD. [I.31] Therefore ADEB is a parallelogram. |
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