-12- The surface area of a solid sphere is increasenby - 21 - - without changing its shape- Findsnpercentage increase in its-n- begin-array- - l l - - text - -i- radius - - - - text - -ii- volume - - end-array- -

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"12. The surface area of a solid sphere is increase\nby \\( 21 \\% \\) without changing its shape. Finds\npercentage increase in its:\n\\( \\begin{array} { l l } { \\text { (i) radius } } & { \\text { (ii) volume } } \\end{array} \\)"