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Pp=384-240
Pp=144 cm²
Pp=a²
Pp=144
144=a²
a=√144
a=12cm
Pb=240
Pb=4*1/2*a*h
240=4*1/2*12*h
240=24h /:24
h=10cm
H²=10²-6²
H²=100-36
H²=64
H=√64
H=8cm
V=1/3*Pp*H
V=1/3*144*8
V=384cm³