The radii of two cylinders A and B are in the ratio of 5 : 6 and the heights are in the ratio of 7 : 4 respectively. The ratio of the curved surface area of cylinder B to that of A is:

35 : 24 24 : 35 49 : 35 35 : 49

24 : 35

We know that, Curved surface area of cylinder = 2πrh The ratio of radius = 5 : 6 The ratio of height = 7 : 4 The ratio of curved surface area of cylinder B and A = (6 × 4) : (5 × 7) = 24 : 35