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H = 1,2m = 12dm
Pp = πr²
Pp = π * 5²
Pp = 25π dm²
V = Pp * H
V = 25π * 12
V = 300πdm³
V ≈ 300 * 3,14 = 942dm³ = l
5V ≈ 5 * 942 = 4710l
odp. w 5 takich beczkach zmiesci sie ok. 4710l farby.
v=0,78 * 1,2= 0,93 m³ = 0,93 l
5*0,93=4,65
4,65 * 1000= 4650l
Pp=π50²
pp= π2500
2500*π(3.14)=7850cm²
7850*120=942000cm²=942l
942*5=4710l
W tych 5 beczkach zmieści się 4710l farby.