Question

a cylindrical vessel without lid has to be tin coated including both of its sides if the radius of its base is 1/2 m and its height is 1.4m calculate the coast of tin coating at the rate of rs 50 per 1000cm2​

Answer 1

Answer:

We have,

r=70cm, h=1.4m=140cm

∴ Area to be tin coated=2(2πrh+πr

2

)=2πr(2h+r)

=2×

7

22

×70(280+70)=154000cm

2

.

Cost of tin coating Rs. 3.50=1000cm

2

Total cost=3.50×

1000

154000

=539