what is radius? brainliest marking to first one.
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In classical geometry, a radius of a circle or sphere is any of the line segments from its center to its perimeter, and in more modern usage, it is also their length. The name comes from the Latin radius, meaning ray but also the spoke of a chariot wheel.
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Radius: " A straight line extending from the center of a circle or sphere to the circumference or surface is called Radius of circle / sphere.
The radius of a circle is half the diameter.
i.e Diameter (D) = 2× Radius (R)
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