Hart, C. A. (Clara Avis), b. 1863, Feldman, Daniel D., b. 1872 · New York, American Book Co · leaf 434
BOOK IX 423 Proposition V. Theorem 918. A spherical angle is measured by the arc of agreat circle having the vertex of the angle as a pole andintercepted by the sides of tlie angle, prolonged if nec-essary. P__ ^ p … Given spherical Z APB, with CD an arc of a great O whose poleis P and which is intercepted by sides PA and PB of Z APB, To prove that Z APB oc CD, Outline of Proof 1. Draw radii OP^ OC, and OD. 2. From P draw PR tangent to PA and PT tangent to PB, 3. Prove OC and OD each ± OP. 4. Prove OC II PR, OD…
Geometry, Plane · Geometry, Solid
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