The distance of the c.g. of a semi-circular arc of radius r from its diameter along the radius of symmetry, is
\(\frac { 3r } { n} \)
\(\frac {2r } {3 n} \)
\(\frac { 2n} { r} \)
\(\frac { 2n} {n} \)
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Answer : Option D
Explanation :
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