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FG is not perpendicular to DE.
Similarly we can prove that neither is any other straight line except FC; therefore
Being what it was required to prove.
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T H E E L E M E N T S |
Book III Proposition 18 | |
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Therefore FG is not perpendicular to DE. Similarly we can prove that neither is any other straight line except FC; therefore Being what it was required to prove. |
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