Question

the inner diameter of a circular well is 3.5m.it is 10m deep. find1. it's inner curved surface area
2.the cost of plastering this curved surface at the rate of rs. 40per m*m​

Answer 1

Answer:

Curved Surface Area : 110 m*m

Cost : 4400 Rs.

Step-by-step explanation:

Curved Surface Area for a cylinder(or well in this case) = 2*pi* radius*height

= (2*22*3.5*10)/7

=110m*m

Now, the cost of plastering 1 m*m area is 40Rs.

Then, plastering the whole 110m*m area would cost us, 110*40 = 4400Rs

Answer 2

d=3.5,r=1.75m

h=10m

(1) inner curved surface area of well=2πrh

=2*22/7*175/100*10

=110m^

(2) the cost of painting the wall

1m^ = 40

110m^ = ?

110*40=4400

the cost of painting the inner wall ofw well is 4400 rs.