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P=1248cm²
a=12cm
Pp=a²
Pp=12²
Pp=144cm²
Pb=4*a*h
P=2*144cm²+4*a*h
1248cm²=288cm²+4*12*h
1248cm²=288cm²+48h
48h=1248cm²-288cm²
48h=960cm/:48
h=20cm
odp.wysokość graniastosłupa wynosi 20cm