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 (1880)
Todhunter, I. (Isaac), 1820-1884 · Toronto : Copp, Clark · leaf 41
ogether 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 sides.Therefore all the interior angles…
Geometry · Euclid's Elements · Mathematics, Greek
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