T H E E L E M E N T S |
Book III Proposition 22 | |
But the angle CAB is equal to the angle BDC, for they are in the same segment BADC; [III. 21] and the angle ACB is equal to the angle ADB, for they are in the same segment ADCB; [III. 21] therefore the whole angle ADC is equal to the angles BAC, ACB. Let the angle ABC be added to each; therefore the angles ABC, BAC, ACB are equal to the angles ABC, ADC. |
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