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p=½a²=18cm²
a²=18:½
a²=36
a=6cm= tworzaca stożka
a√2=6cm
a=6√2:2
a=3√2cm=h=r stożka
v=⅓π×(3√2)²×3√2=18√2πcm³
pole=πr²+πrl=π×(3√2)²+π×3√2×6=18π+18√2π=18π(1+√2)cm²