surface area of a cylinder?
No. In 2-dimensional space, a circle and in 3-d, a sphere.
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The set of all points in space that are the same distance from a given point is called a sphere.
A spherical surface, with its center at the given point, and its radius equal to the given distance.
They form the sphere whose center is the given point and whose radius is the given distance.
In 2-dimensional space, a circle. In 3-dimensional space, a sphere.
A circle or sphere or hypersphere in 2 or 3 or more dimensions (respectively).