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Pb=50π[cm²]
Pb=2πsr
Pb=Obw r
s-promień podstawy, Obw-obwód podstawy
Obw=Pb/r
Obw=50π/10=5π
Obw=2πs
s=Obw/2π
s=5π/2π=2,5[cm]
Pole podstawy Pp
Pp=πs²
Pp=π2,5²=6,25π[cm²]