Wentworth, G. A. (George Albert), 1835-1906 · Boston, Ginn & company · leaf 129
fig. 77 … Isosceles Equilateral Eight Oblique Fig. 78 Spherical triangles are named isosceles, equilateral, equi-angular, right, and oblique, under the same conditions as planetriangles are named isosceles, equilateral, equiangular, right,and oblique. THE RIGHT SPHERICAL TRIANGLE 141 The following…
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