Hart, C. A. (Clara Avis), b. 1863, Feldman, Daniel D., b. 1872 · New York, American Book Co · leaf 442
Given spherical A ABC.To prove ^^ + ^C > CA. Argument 1. Z AOB + Z BOC > Z COA. 2. Z AOB oc AB, Z BOC^BC, Z COA oc CA. 3. .. AB + BC> CA. Q.E.D. Reasons 1. §710. 2. § 940, a. 3. § 362, b. Proposition X. Theorem 942. The sum of the sides of any spherical polygon isless than 360\
Geometry, Plane · Geometry, Solid
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