The radius of a cylinder is 2 r units and height is 3 r units. Find the curved surface? Choose one:
A) 27	B) 16	C) 12	D) 18	E) 11
2 * π * 2r * 3r = 12 πr2   Answer:12
<result>C</result>
The radius of a cylinder is 2 r units and height is 3 r units. Find the curved surface?