Cross-section 5558

How many m² of sheet metal is needed to cover 4 m high chimneys with a rectangular cross-section with dimensions of 2.5 m and 1.2 m. Add 1/20 to the folds.

Correct answer:

S =  31.08 m2

Step-by-step explanation:

c=4 m a=2.5 m b=1.2 m  S1=2 c (a+b)=2 4 (2.5+1.2)=5148=29.6 m2  k=1+1/20=2021=1.05  S=k S1=1.05 29.6=25777 m2=31.08 m2

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