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a²=100
a=√100=10
czyli
Pb=2πrh
2πr=h
2πr=a
2πr=10 /;2
πr=5
r=5/π --->promien walca
h=a=5
Pp=πr²=π·(5/π)²=π·25/π²=25/π [j²]
V=Pp·h=25/π·5=125/π [j³]