T H E E L E M E N T S |
Book VI Proposition 18 | |
And, since the angle CFD is equal to the angle AGB, and the angle DFE to the angle BGH, therefore the whole angle CFE is equal to the whole angle AGH. For the same reason the angle CDE is is also equal to the angle ABH. And the angle at C is also equal to the angle at A, and the angle at E to the angle at H. |
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