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d=10√12
Otrzumana bryla to dwa stozki o
promieniu d/2 i wys d/2
polaczone podstawami
obliczam bok kwadratu
10√12=a√2---->a=10√12/√2=10√6
Pb1=πd/2*a=π*5√12*10√6=50π√72=300π√2
P=2Pb1=600π√2