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Reference.org
Equivalent radius
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<p>In <a href="/facts/Applied_science/13h5uYCH">applied sciences</a>, the equivalent radius (or mean radius) is the radius of a circle or sphere with the same perimeter, area, or volume of a non-circular or non-spherical object. The equivalent diameter (or mean diameter) ( D {\displaystyle D} ) is twice the equivalent radius. </p>