Wentworth, G. A. (George Albert), 1835-1906 · Boston, Ginn & company · leaf 130
Fig. 79 Fig. 80 3. The sum of the angles of a spherical triangle is greaterthan 180° and less than 540°. 4. If from, the vertices of a spherical triangle as poles,arcs of great circles are drawn, another triangle is formed sorelated to the first that each angle of either triangle is thesupplement…
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