Concrete pipe

The concrete pipe is cylindrical with an inner diameter of 60 cm and an outer 67 cm. Calculate the surface of the concrete pipe if it is 10 m long.

Correct answer:

S =  40 m2

Step-by-step explanation:

d1=60 cm m=60:100  m=0.6 m d2=67 cm m=67:100  m=0.67 m L=10 m  r1=d1/2=0.6/2=103=0.3 m r2=d2/2=0.67/2=20067=0.335 m  S1=π L (d1+d2)=3.1416 10 (0.6+0.67)39.8982 m2  S2=2 (π r22π r12)=2 (3.1416 0.33523.1416 0.32)0.1396 m2  S=S1+S2=39.8982+0.1396=40 m2



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