T H E E L E M E N T S |
Book II Proposition 10 | |
Then since EC is equal to CE, the angle EAC is also equal to the angle AEC; [I.5] and the angle at C is right; therefore each of the angles EAC, ACE is half a right angle. [I.32] For the same reason each of the angles CEB, EBC is also half a right angle, therefore the angle AEB is right. |
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