A circle or sphere.
A sphere
a sphere
vertices
Yes, that is correct
A circle.
Yes. In a perfect sphere the centre is an equal distance from any point from the surface.
Surface of a sphere
That shape is called a circle.
The radius of a sphere is equal distance from the center of the sphere to all points within the sphere.
A spherical surface, with its center at the given point, and its radius equal to the given distance.
It is a circle or a sphere
The surface of a sphere. It cannot be a sphere since points which are not on its surface will be nearer to the centre.