Measure of a Spherical Angle
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Diagram used to prove the theorem: “A spherical angle is measured by the arc of a great circle described from its vertex as a ole and included between its sides (produced if necessary).”
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Geometric Theorems and ProofsSource
Arthur Latham Baker The Elements of Solid Geometr with Numerous Exercises (Boston, MA: Ginn & Company, 1893)
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