Answer : The letter (C) on the given diagram below represents a radius of circle.
Step-by-step explanation :
Circle : It is a simple closed shape in which all the points are the same distance from the centre.
Circumference : It is the distance once around the circle.
Diameter : It is the straight line segment that passes through the centre of the circle.
Radius : It is the distance from the centre to the circumference.
In the given diagram,
The letter A represent the centre of the circle.
The letter B represent the diameter of the circle.
The letter C represent the radius of the circle.
The letter D represent the circumference of the circle.
Hence, the letter (C) on the given diagram below represents a radius of circle.