Hart, C. A. (Clara Avis), b. 1863, Feldman, Daniel D., b. 1872 · New York, American Book Co · leaf 445
ftwelve was familiar with the standard mathematical works of that timeand who is remembered as the discoverer of the well-known law ofrefraction of light. Ex. 1519. Determine the polar triangle of a spherical triangle havingtwo of its sides quadrants and the third side equal to 70°; 110°; (90 — a)°… … E a Given polar A ABC and abc, with sides denoted by a, 6, c,and a, V, c\ respectively. To prove: (a) Z^+a = 180°, Z5+?> = 180^ Zc+c=180°;[h) Z^+a=180°, Z ^+6=180°, Z (7+c=180°. (<z) Argument Only 1. Let arcs AB and AC (prolonged if necessary) intersect arc5c at D and E, respectively; then…
Geometry, Plane · Geometry, Solid
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