A diameter is a whole line and a radius is just half not a whole that is the difference
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Radius is the shortest distance via straight line between the center point of the circle and its perimeter. Diameter is the greatest distance via straight line from one perimeter of the circle to the opposite perimeter. Diameter = 2x Radius.
The length of a radius is not the length of a diameter. The diameter is two times the length of the radius.
Either.... Halve the diameter; or Divide the circumference by 2pi; or Calculate the difference between the location fo the centre and the location of a point on the circumference.
When you have the radius of a circle and you are trying to find the diameter, multiply the radius by two; the answer is the diameter. If you have the diameter and want to find the radius, divide the diameter by two; the answer will be the radius. The diameter is 54 centimeters.
diameter is longer. radius is half of diameter