A closed geometric figure on the surface of a Sphere which is formed by the Arcs of Great Circles. The spherical polygon is a generalization of the Spherical Triangle. If is the
sum of the Radian Angles of a spherical polygon on a Sphere of Radius ,
then the Area is

**References**

Beyer, W. H. *CRC Standard Mathematical Tables, 28th ed.* Boca Raton, FL: CRC Press, p. 131, 1987.

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1999-05-26