T H E E L E M E N T S	Book I   Proposition 15
	For, since     the straight line AE stands on the straight line CD, making the angles CEA, AED,     the angles CEA, AED are equal to two right angles. [1.13] Again, since     the straight line DE stands on the straight line AB, making the angles AED, DEB,     the angles AED, DEB are equal to two right angles. [1.13]
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