Question

the radii of 2 right circular cylinders are in the ratio 3:2 and their height are in the ratio 1:2. ratio of their curved surface areas is ?​

Answer 1

Answer:

3:4

please find attached my solution.

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and it got cut , C1 and C2 are two cylinders

Answer 2

Answer:

• Let the radius be x cm
• Therefore, radius of first cylinder=3x and radius of 2nd cylinder=2x
• Let the height be h cm
• Therefore, height of the 1st cylinder=h and height of the 2nd cylinder=2h
• we know that surface area of the cylinder=2πrh
• Ratio=surface area of 1st cylinder÷surface area of 2nd cylinder
• 2×π×3x×h÷2×π×2x×2h

=3÷4

therefore, ratio will be 3:4