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 29
[I. 19. tlierefore the side BD is greater than the side BG.But BD is equal to BA and A G.Therefore BA, AG are greater than BG. In the same manner it may be shewTi that AB, BG arogreater than AG, and BG, GA greater than AB. Wherefore, any two sides &c. q.e.d. PROPOSITION 21. THEOREM. If from,… … 24 EUCLIDS ELEMENTS. Let ABC be a triangle, and from the points B, (7,the ends of tlie side EC,let the two straisfht lines£TJ, CD be drawn to thepoint D within the tiian^de: BD, DC shall be lessthan the other two sidesBA^ AG oi the triangle,but shall contain an angleBDC greater than theangle 5^ a…
Geometry · Euclid's Elements · Mathematics, Greek
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