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a√2=6dm
a=6√2:2
a=3√2dm=bok kwadratu
otrzymujesz walec o :
r=3√2
h=3√2
pole podstawy=πr²=π(3√2)²=18π
v=18π×3√2=54π√2dm³
pole=2×18π+2πrh=36π+2π×(3√2)²=36π+36=72πcm²