A circle or a sphere would fit the given description.
Surface of a sphere
Straight line
A circle is the set of all the points that are the same (arbitrary) distance (called the radius) from some (arbitrary) point (called the center).
A sphere
A circle or a sphere
A curved surface on which all points are the same distance from the center is called a sphere.
===> "circle", with center at the "single point" and radius of the "certain distance".
Surface of a sphere
It is a sphere.
Because the center of the fan is attacked to something, and if the fan is relatively rigid, other points on the fan keep the same distance from that center. The set of points in a plane that has the same distance from the center is called a circle.
the center of the circleThat point is called the "center" of the circle.
The distance from the center of a lens to one of its focal points is the focal length of the lens.
That's called the center
a sphere
That shape is called a circle.
a circle
They are called equidistant points and form points on a sphere for a solid or a circle on a plane figure.