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H=r
Pb=2πr²
200π=2πr²
r=√100
r=10
Pp=πr²
Pp=π10²=100π
200π = 2π r² /:2π
r² = 100
Pp=π r ²
Pp=100π
200π = 2πrh
r=h
200/2 = 100
Pierwistek ze 100 = 10
r=10
h=10
Pp = πr^2
Pp = 10^2π
Pp = 100π