Math, asked by alx1, 1 year ago

it is required to make a close cylindrical tank of height 1cm and base diameter 140cm from a melal sheet. How many square metres of the sheet are required for the same?

anni5580: Friend i have also tried to solve this question from ncert book but my answer comes 22 but the answer is 2

Answers

Answered by aadi55

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anni5580: read question properly

aadi55: ohh

aadi55: in metre square

anni5580: yes. the answer comes is 7.48 metre square according to the book

aadi55: un

aadi55: uh

aadi55: let me seee

aadi55: it should be. 3.124m square

anni5580: yaa i know my answer also comes 3.124m square... but according to book it should be 7.48 ... so i am very confused

aadi55: mmm

Answered by Anonymous

Answer:

It is given that diameter of cylindrical vessel is 140 cm

Diameter = 140 cm

Therefore,

Radius of cylindrical vessel = 140/2 = 70 cm

Now,

Converting the cm in m we get,

70 cm = 70/100 = 0.7 m

And it is also given that height of cylindrical vessel is 1 m

Height = 1 m

Area of sheet required = TSA of cylinder

=> 2πr (r + h)

=> 2 × 22/7 × 0.7 (0.7 + 1)

=> 4.4 × 1.7

=> 7.48 m²

Therefore, Area required to make closed cylindrical vessel is 7.48 m².

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