The surface area of a sphere is same as the curved surface area of a right circular cylinder whose height and diameter are 8 cm each. The radius of the sphere is  Select
A) 3 cm B) 4 cm C) 6 cm D) 8 cm E) None
Solution   4Î R2	= 2Î 4x8   â‡’ R2 = (4x8/2)   â‡’ 16   â‡’ R = 4 cm.   Answer 4 cm
<result>B</result>
The surface area of a sphere is same as the curved surface area of a right circular cylinder whose height and diameter are 8 cm each. The radius of the sphere is