(xiv) A rectangular sheet of paper of size 11 cm x 7 cm Is first rotated about the side 11 cm and then about the side 7 cm to form a cylinder, as shown in the diagram. The ratio of their curved surface areas is:

(a) 1:1
(b) 7:11
(c) 11:7
(d) 11π/7 : 7π/11

Solution