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Pc=276cm²
Pc=2Pp+4Pb
Pc=2a² + 4ah
2*(5)² + 4*5*h=276
50+20h=276
20h=226
h=11,3cm
V=Pp*h
V=a²*h
V=5²*11,3
V=25*11,3
V=282,5cm³