Find the ratio of the curved surfaces of two cylinders of same heights if their radii are in the ratio 1:2?
Choose the correct answer.
A) 1:2 B) 2:3 C) 2:9 D) 2:1 E) 2:2
1:2   1:2nswer: 1:2
<result>A</result>
Find the ratio of the curved surfaces of two cylinders of same heights if their radii are in the ratio 1:2?