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a=8cm
b=4cm
h=3cm
h2=0,8*15cm=12cm
Wzór:
Pr=a*h
Vg=Pp*h2
Obl:
Pr=8cm*3cm
Pr=24cm2-pole podstawy
Vg=24cm2*12cm
Vg=288cm3
Odp. Objętość tego graniastosłupa wynosi 288cm3