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 16
N 5. THEOREM. The angles at the base of an isosceles triangle are equalto one another; and if the equal sides he produced theangles on the other side of the hose shall he equal to oneanother. Let ABG be an isosceles triangle, having the side ABequal to the side AG, and let the straight lines AB,… … andjoini^C, GB. Because^i^isequalto-46r, \Comtr.aPxd AB Ui AG^ [Eijpotkesis. the two sides FA, AC dire equal to thetwo sides GA, AB, each to each; andthey contain the angle FA G commonto the two triangles AFC, AGB;therefore the base FC is equal to thebase GB, and the triangle AFC tothe triangle A…
Geometry · Euclid's Elements · Mathematics, Greek
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