The surface area of a sphere is same as the curved surface area of a right circular cylinder whose height and… · ABC26GN5019

Subject: General Aptitude · Chapter: Volume and Surface Area

The surface area of a sphere is same as the curved surface area of a right circular cylinder whose height and diameter are 12 cm each. The radius of the sphere is

(a)3 cm

(b)4 cm

(c)6 cm

(d)12 cm

Answer

Answer (as printed): C

Explanation

$4 \pi R^{2}=2 \pi \times 6 \times 12 \Rightarrow R^{2}=\left(\frac{6 \times 12}{2}\right)=36 \Rightarrow R=6 \mathrm{cm}$.

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