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A sphere is a perfectly round geometrical object in three-dimensional space that is the surface of a completely round ball.
Area = 4 * π * radius3
A = 4 * π * r3 =
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"Sphere" Math @ STANDS4. STANDS4 LLC, 2020. Web. 7 Apr. 2020. <http://math.stands4.com//calculators/sphere-volume>.