Metal sheets

How much metal sheet is needed to produce 8 gutters 4 m long and 12 cm in diameter? During production joints calculate at 3% of total consumption.

Correct result:

A =  6.2128 m2

Solution:

D=12 cm→ m=12/100  m=0.12 m r=D/2=0.12/2=350=0.06 m l=8⋅ 4=32 m  S1=π⋅ D⋅ l=3.1416⋅ 0.12⋅ 32≐12.0637 m2  q=3%=1+3100=1.03  A=S1/2⋅ q=12.0637/2⋅ 1.03=6.2128 m2

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