Question

The height of a right circular cylinder is 10.5 m. Three times the sum of the areas of its two circular faces is twice the area of the curved surface. Find the volume of the cylinder.
Plzzz give me full answer

Answer 1

ANS:    Given: height of cylinder = 10.5

According to the question,

3(2 πr2) = 2(2πrh)      [since  three times the sum of the areas of its two circular faces is twice the area of the                                              curved surface area]

=> 6πr2  = 4πrh

=> 6πr2  / 4πr = h

=> 3r/2 = 10.5                [since h = 10.5]

=> r = 2*10.5/3 = 7cm

Therefore, the radius of the base is 7cm.

Answer 2

Answer:

Answer is in the picture check it.

The answer is 7 cm check in the picture.

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