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z wlasnosci kata ostrego 45stopni wynika zaleznosc:
2r=h
h√2=d
h√2=4√2 /:√2
h=4 --->wysokosc walca
2r=4 /;2
r=2 --->promien walca
Pb=2πrh=2π·2·4=16π [j²]
V=πr²·h=2²π·4=4·4π=16π [j³]