12. A right circular cylinder just encloses a sphere ofradius a cm, th – InterviewSolution

1.	12. A right circular cylinder just encloses a sphere ofradius a cm, then the curved surface area of thecylinder is:(a) 4Ďa2cm(c) 3macmIT-II (2011)](b) 2na'cm2(d) 4Ďa2 cm2
Answer» Curved surface area of the cylinder =2πah =2πa(2a)= 4πa^2Answer d.

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