Question

a fixed cylindrical metal tank having radius 4.9cm and height 7.5 is to be painted from inside and outside what will it cost at the rate 10rs per m2

Answer 1

Answer:

a fixed cylindrical metal tank having radius 4.9cm and height 7.5 m is to be painted from inside and outside

cost at the rate 10rs per m2 = Rs 46.5

Step-by-step explanation:

Inside surface area = 2πrh + 2πr²

= 2πr( h + r)

= 2 * (22/7)(4.9) (4.9 + 750)   ( 7.5 m = 750 cm)

=  (30.8)*(754.9)

= 23250.92 cm²

= 2.325 m² ( 1cm² = 1/10000 m²)

outside surface area = 2πrh + 2πr² = 381.92 cm² ( neglecting thickness of cylinder)

total Surface area = 2 * 2.325 = 4.65 cm²

Cost = Rs 10 /m²

Total cost = 10 * 4.65 = Rs 46.5

Answer 2

Answer:

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