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AC is equal to AD,
the angle ACD is also equal to the angle ADC; [I.5]
therefore
the angle ADC is greater than the angle DCB;
therefore
the angle CDB is much greater than the angle DCB;
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T H E E L E M E N T S |
Book I Proposition 7 | |
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Then, since AC is equal to AD, the angle ACD is also equal to the angle ADC; [I.5] therefore the angle ADC is greater than the angle DCB; therefore the angle CDB is much greater than the angle DCB; |
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