T H E E L E M E N T S |
Book III Proposition 1 | |
But, when a straight line set up on a straight line makes the adjacent angles equal to one another,
each of the equal angles is right [I.Def.10]; therefore the angle GDB is right. But the angle FDB is also right; therefore the angle FDB is equal to the angle GDB, Therefore G is not the center of the circle ABC. |
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