T H E E L E M E N T S |
Book IV Proposition 3 | |
But the angles DEG, DEF are also equal to two right angles; [I.13] therefore the angles AKB, AMB are equal to the angles DEG, DEF, of which the angle AKB is equal to the angle DEG; therefore the angle AMB which remains is equal to the angle DEF whcih remains. Similarly it can be proved that the angle CNB is also equal to the angle DFE. |
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