Question

If the ratio of radii of two cylinders of equal height is 1:3,find the ratio of their curved surface area

Answer 1

Answer:

2:6

Step-by-step explanation:

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Answer 2

Step-by-step explanation:

Let the common multiple be x.

Radius of 1st cylinder = x

Radius of 2nd cylinder = 3x

Curved Surface Area of 1st cylinder = 3.14 x Radius x h

Curved Surface Area of 2nd cylinder = 3.14 x Radius x h

CSA of 1st Cylinder/ CSA of 2nd Cylinder = 3.14 x x x h/ 3.14 x 3x x h

                                                                    = x/3x

                                                                    = 1/3