Hart, C. A. (Clara Avis), b. 1863, Feldman, Daniel D., b. 1872 · New York, American Book Co · leaf 446
cV … a C Given spherical A ABC with sides denoted by a, h, and c.To prove /.A + Z.B + /.G> 180° and < 540°. Argument 1. Let A abc, with sides denoted by a\b, and c, be the polar of A ABC, Then Z ^ + a = 180°, Z^ + 5 = 180°,Z(7+c=180°. .•.Z^ + Z5+Z(7 + (a+6+c)=540°. But a + 6 + c < 360°. .-. Z^…
Geometry, Plane · Geometry, Solid
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