T H E E L E M E N T S |
Book VI Proposition 4 | |
For let BC be placed in a straight line with CE. Then since the angles ABC, ACB are less than two right angles; [I.17] and The angle ACB is equal to the angle DEC, therefore the angles ABC, DEC are less than two right angles; therefore BA, ED, when produced, will meet. [I.Post.5] Let them be produced and meet at F. |
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