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the angle at A is half of the angle BGC, and the angle at D half of the angle EHF. [III.20]
therefore
the angle at A is also equal to the angle at D.
Being (the remainder of) what it was required to prove.
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T H E E L E M E N T S |
Book III Proposition 27 | |
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And the angle at A is half of the angle BGC, and the angle at D half of the angle EHF. [III.20] therefore the angle at A is also equal to the angle at D. Being (the remainder of) what it was required to prove. |
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