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
36 EUCLIDS ELEMENTS. Corollary 1. All the interior angles of any recti-lineal figure, together with four right angles, are equal totwice as many right angles as the figure has side.«. For any rectilineal figure ABCDE can be divided intoas many triangles as the figure has sides, by dniwingstraight*…
Geometry · Euclid's Elements · Mathematics, Greek
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