A sphere
Surface of a sphere
A circle or a sphere
The centre of a circle is equal distance from all points of its circumference
The radius is always at a fixed, unchanging distance from the center of a circle to all the surrounding points.
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
A circle or sphere.
The radius of a sphere is equal distance from the center of the sphere to all points within the sphere.
It is a circle or a sphere
A curved surface on which all points are the same distance from the center is called 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.