The radius of a circle, usually represented by the variable r,r, is defined as the distance between the center of the circle and its outer edge, known as the circumference.

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Since every circle is symmetrical, the radius will have the same length from the center to any point on the circumference. In a sphere, the same relation applies but for any point on the boundary. Furthermore, the radius of a circle is exactly half the length of the circle's diameter.

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