It is the circle's radius
A circle or a sphere would fit the given description.
Circle
Yes, all of the radii in a single circle are congruent.
Circle
To qualify as a function, for every value of "x" there must be but a single "y" value. This isn't the case with a circle.
A line that is always the same distance from a single fixed point is called a circle. The fixed point is known as the center of the circle, and the constant distance from this point is referred to as the radius. Every point on the circle is equidistant from the center, defining its circular shape.
That's called a "circle".
A circle is a set of points equidistant ( the same distance ) away from a single point, the center of the circle.
A circle or a sphere would fit the given description.
===> "circle", with center at the "single point" and radius of the "certain distance".
Parts of a circle include the diameter, circumference, radius, and center. The diameter of a circle is a chord passing through the center. The center is a single point at which the distance to locations on the circumference are equal. The circumference is the perimeter of the circle. The radius of the circle is half the diameter, and the distance from the center to a point on the outlying circumference.
Circle
Circle
There is no chord that is always smaller since, in the limit, the chord reaches a single point on the circumference - when it it is no longer a chord!
In geometry, a circle is a two-dimensional shape formed by all points that are one consistent distance or "radius" from a single central point. For example, if the radius is 5 inches, then the shape formed from the preceding rule would be a perfectly round circle measuring 10 inches in "diameter" (the distance of any one point on a circle to the farthest point on the same circle).
I've always called it "single, but unavailable"
You are describing a sphere in three-dimensional space or a circle in two-dimensional space. In both cases, all points are equidistant from a single fixed point, known as the center. The fixed distance from the center to any point on the shape is called the radius.