The elements of Euclid for the use of schools and colleges : comprising the first two books and portions of the eleventh and twelfth books; with notes and exercises . common vertex of the triangles, that is, together with four right angles. [I. 15. Corollary all the interior angles of the figure, together witiifour right angles, are equal to twice as many right anglesas the figure has sides. Corollary 2, All the exterior angles of any recti-lineal figure are together equal tofmr right angles. Because every interior angleABC. with its adjacent exteriorangle ABD, is equal to tworight
The elements of Euclid for the use of schools and colleges : comprising the first two books and portions of the eleventh and twelfth books; with notes and exercises . common vertex of the triangles, that is, together with four right angles. [I. 15. Corollary all the interior angles of the figure, together witiifour right angles, are equal to twice as many right anglesas the figure has sides. Corollary 2, All the exterior angles of any recti-lineal figure are together equal tofmr right angles. Because every interior angleABC. with its adjacent exteriorangle ABD, is equal to tworight angles; [ therefore all the interior anglesof the figure, together with allits exterior angles, are equal totwice as many right angles asthe figure has sides. But, by the foregoing Corollary all the interior angles of thefigure, together with four right angles, are equal to twiceas many right angles as the figure has all the interior angles of the figure, together withall its exterior angles, are equal to all the interior angles ofthe figure, together with four right all the exterior angles are equal to four
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