The radius of a circle is defined as the distance from the centre-point to the circumference.
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Length of a radius is always half the diameter of a circle. This means that the circle has a radius of 2cm.
The radius of the circle works out as 5 units in length
If you mean "what is the radius of a circle", then the answer is the line segment or length from the center of circle to the set of points that form the circle. The radius is also half of the diameter.
The length of an arc of a circle refers to the product of the central angle and the radius of the circle.
Yes, the diameter of a circle is twice the length of the radius.