Q. 115.0( 3 Votes )

# Find the cost of plastering the inner surface of a well at Rs. 9.50 per m^{2}, if it is 21 m deep and diamwter of its top is 6 m.

Answer :

Given,

Height of cylinder = 21 m

Diameter of cylinder = 6 m

Radius of cylinder =

So,

Curved surface area of cylinder =

∴ Cost of plastering the inner surface at rate Rs.9.50 per m^{2} = 396×9.50 = Rs.3762

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PREVIOUSThe height of a right circular cylinder is 10.5 cm. If three times the sum of the areas of its two circular faces is twice the area of the curved surface area. Find the radius of its base.NEXTA cylindrical vessel open at the top has diameter 20 cm and height 14 cm. Find the cost of tin-plating it on the inside at the rate of 50 paise per hundred square centimetre.

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