The radius of a sphere is equal distance from the center of the sphere to all points within the sphere.
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Treat the 3D sphere as a 2D circle. The radius for the sphere is the same radius as for the circle. No matter where on the sphere you place a mark, the distance (radius) from the mark to the centre of the sphere will always be the same as the circle.
The sphere's radius will be 7.973 cm
Radius of sphere is 6 meter.
The radius of a sphere is 1/2 of its height.
The volume of a sphere with a radius of 13 is: 9,203 units3