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V=4/3*<pi>r3
V=4/3*<pi>*5 <do 3 potęgi>=4/3*<pi>*125=500<pi>/3=166.6(6)<pi>= <w przybliżeniu> 166.7<pi> dm3
r=5dm
V = ⁴/₃ π r³ = ⁴/₃ π* 5dm³ = ⁴/₃ π 125dm = 500/3 π dm³
V ≈ 500/3 * 3.14 dm³ = 500/3 * 314/100 = 5/3 * 314/1 = 1570/3 dm³