How much metal is needed for production 60 pieces of gutter pipes with the diameter 17 cm and length of 6 m? The plate bends add 6% of the material.

Correct result:

S =  203.8 m2


n=60 D=17 cm m=17/100  m=0.17 m l=6 m  q=6%=1+6100=1.06  o=π D=3.1416 0.170.5341 m S1=o l=0.5341 63.2044 m2  S=n S1 q=60 3.2044 1.06=203.8 m2

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