T H E E L E M E N T S |
Book IV Proposition 6 | |
Then, since BE is equal to ED, for E is the center and EA is common and at right angles, therefore the base AB is equal to the base AD. [I.4] For the same reason each of the straight lines BC, CD is also equal to each of the straight lines AB, AD; therefore the quadrilateral ABCD is equilateral. |
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