T H E E L E M E N T S |
Book I Proposition 47 | |
Then, since each of the angles BAC, BAG is right, it follows that with a straight line BA, and at the point A on it, the two straight lines AC, AG not lying on the same side make the adjacent angles equal to two right angles; therefore CA is in a straight line with AG. [I.14] For the same reason BA is also in a straight line with AH. |
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