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The inner diameter of a circular well is 3.5 m and it is 10 m deep. Find the cost of plastering the inner surface at ₹4 per sq. m.
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Step-by-step explanation:
(i)r= radius=
2
3.5
=1.75 , h= depth of the well=10m
⇒Curved surface area
=2πrh
=(2× 722 ×1.75×10)m
2
=110m
2
⇒(ii) Cost of plastering = Rs 40 per m
2
The cost of plastering the curved surface = Rs (110×40)= Rs 4400.
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