a radius is half the diameter of a circle
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The radius of a circle is 1/2 of the diameter.
surface area is the area of a 3D object radius is half of the diameter of a circle
The diameter of a circle is twice its radius.
The radius is half the diameter of a circle.
Radius is from the center of a circle to the outer edge. Diameter is from the outer edge to the opposite outer edge, i.e., through the center. The diameter has twice the length of the radius.