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25 circular plates, each of radius 10.5 cm and thickness 1.6 cm, are placed one above the other to form a solid circular cylinder. Find the curved surface area and the volume of the cylinder so formed.

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Rd sharma class 10 maths exercise-16.1 mensuration.

In tbis question we have to find curved surface area and volume of the cylinder formed from 25 circular plates, each of radius 10.5cm and thickness 1.6 cm form a solid cylinder.

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1 Answer

  1. Given,

    250 circular plates each with radius 10.5 cm and thickness of 1.6 cm.

    As the plates are placed one above the other, the total height becomes = 1.6 x 25 = 40 cm

    We know that,

    Curved surface area of a cylinder = 2πrh

    = 2π × 10.5 × 40 = 2640 cm2

    And, volume of the cylinder = πr2h

    = π × 10.52 × 40 = 13860 cm3

    Therefore,

    The curved surface area of the cylinder is 2640 cm2 and the volume of the cylinder is 13860 cm3

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