Question

the inner diameter of a circular well is 3.5m. it is 10m deep . find
(1) its inner curved surface area,
(2) the cost of plastering this curved surface at the rate of Rs.40 per m2​

Answer 1

Answer:

7" ('Iiudgjuuxiic 47748

Answer 2

Answer:

⇒(i)r= radius= 3.5/2=1.75,

h= depth of the well=10m

⇒Curved surface area

=2πrh

=(2× 22/7 ×1.75×10)m2

=110m2

⇒(ii) Cost of plastering = Rs 40 per m 2

The cost of plastering the curved surface = Rs (110×40)= Rs 4400.