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a^2=8//:^2
a=8/^2
a=4^2
Pp=4^2*4^2=16^2
100%-4^2
120%-x
100x=480^2//:100
x=4,8^2-wysokość graniastosłupa
Pb=4*4^2*4,8^2=76,8^2
Pc=2Pp+Pb
Pc=16^2*2+76,8^2=32^2+76,8^2=108,8^2