Radius is half of the diameter of a circle. (How far the middle is to an edge) The diameter of a circle is how far one side is from the other going through the center of the circle.
The word is also applied to the shorter of the two bones of the forearm, running from the elbow to the thumb side of the wrist. The other forearm bone is the ulna.
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If you mean the radius of a circle then it is half of the circle's diameter
radius is half of a circle. when u make a line from the middle of the circle to the edge would be the radius:]
If you mean the area of a circle then it is: pi times radius squared
Radius of curvature divided by tube diameter. To get the radius of curvature, imaging the bend in the tube is a segment of a circle, the radius of curvature is the radius of that circle.
radius