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czyli P=a²
12=a²
a=√12=2√3 --->bok tego kwadratu
z\atem walec ma
2r=a
2r=2√3
r=2√3/2=√3 --->promien walca
h=a=2√3 --->wysokosc walca
objetosc walca wynosi:
V=πr²·h=(√3)²·π·2√3=3π·2√3=6√3 π [j³]