The surface area of a sphere is same as the curved surface area of a right circular cylinder whose height and diameter are 14 cm each. The radius of the sphere is  Select:
A) 3 cm
B) 4 cm
C) 6 cm
D) 7 cm
E) None
Solution   4Î R2	= 2Î 7x14   â‡’ R2 = (7x14/2)   â‡’ 49   â‡’ R = 7 cm.   Answer 7 cm
<result>D</result>
The surface area of a sphere is same as the curved surface area of a right circular cylinder whose height and diameter are 14 cm each. The radius of the sphere is