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c=PRZECIWPROSTOKĄTNA
pole=½a²=18cm²
a²=36
a=6cm
c=√6²+6²=√72=6√2cm
powstanie stożek o :
r=6
h=6cm
l=6√2
pole=πr²+πrl=π×6²+π×6×6√2=36π+36√2π=36π(1+√2)cm²