T H E E L E M E N T S |
Book VI Proposition 7 | |
But, by hypothesis, the angle at C is less than a right angle; therefore the angle BGC is also less than a right angle; so that the angle AGB adjacent to it is greater than a right angle. [I.13] And it was proved equal to the angle at F; therefore the angle at F is greater than a right angle. But it is by hypothesis less than a right angle: which is abusrd. |
||
Previous Page Return to Propositions Next Page |