Concrete pipe

How much will it cost to cover a 6 m long concrete pipe with an outer radius of 1.5 m and an inner radius of 0.8 meters if one m2 paint costs 24 €?

Correct answer:

x =  377.37 Eur

Step-by-step explanation:

a=6 m D=1.5 m d=0.8 m c=24 Eur/m2  r1=D/2=1.5/2=43=0.75 m r2=d/2=0.8/2=52=0.4 m  S1=a (π Dπ d)=6 (3.1416 1.53.1416 0.8)13.1947 m2 S2=π r12π r22=3.1416 0.7523.1416 0.421.2645 m2  S=S1+2 S2=13.1947+2 1.264515.7237  e=24 2π (6 (1.5+0.8)+1.520.82)=24 2 3.1416 (6 (1.5+0.8)+1.520.82)2323.7733  x=c S=24 15.7237=377.37 Eur



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