The radius of a circle is any line segment from the center of the circle to a point on the circle.
The radius of a circle can also refer to the distance between the center of the circle and any point on the circle. Below, we show the radius with a green segment.
The radius of a sphere is any line segment from the center of the sphere to a point on the sphere.
The radius of a sphere can also refer to the distance between the center of the sphere and any point on the sphere. Below, we show the radius with a green segment.
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