What is the distance between the centre of a circle and any point on the circle called?

Hint: In any circle, when a line segment passes through the centre and connects two end points of the circle , that line segment is called diameter and half of diameter is always a radius.

Complete step-by-step answer:
Diameter is always twice the radius and it is a line segment joining two ends of a circle.
The ratio of circumference and diameter is always constant which is equal to pi().
Diameter is the longest chord.
Area of any circle is given by , where r is the radius of the circle.
When 2 is multiplied by radius it becomes diameter, when is multiplied by diameter it becomes circumference.
In a circle the distance between the centre of a circle and any point on the circle is called radius.

In the above figure OC, OD, OA, OB are the radius of the circle.
Radius is the line segment joining the centre of the circle and any point on the circumference of the circle.

Note: Basically a circle is a curved figure in which the distance from the centre is always equal to all the points lying on the curve.
The distance around the circle is always the circumference of the circle.