Planes of two great circles intersect at diameter {spherical wedge} and divide sphere into four parts. Spherical-wedge volume is (A / (3 * pi / 2)) * pi * r^2, where A is angle between planes, and r is radius.
Mathematical Sciences>Geometry>Solid>Sphere>Spherical Regions
3-Geometry-Solid-Sphere-Spherical Regions
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Date Modified: 2022.0224