Question

A closed metallic cylindrical box is 1.95 m high and it has a base whose radius is 35 em. If the sheet of metal costs 100 per mº then find the cost of material used in the box Also find the capacity of the box in litres​

Answer 1

Answer:

T.S.A. of cyl =2πrh+2πr

2

=2π×(

100

35

)×1.25+2π(

100

35

)

2

⇒TSA=3.52m

2

& as cost of 1m

2

is Rs 80

⇒ Total cost =3.52×80=Rs281.6

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Answer 2

Answer:

35 cm= .35 m

area of the cylinder = 2πr(h+r)

= 2×22/7×.35(1.95 + . 35)

=2×22×.5×2.30

=50.6 m²

cost material used in the box is 50.6×100 =5060 rupees

capacity of the box is = πr²h

= 22/7×.35×.35×1.95

. 750 litter