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b=10
h=5
H=20
Pp= 1/2(8+10)5=45
V=Pp*H
V=45*20=900 cm3
900*8,9=8010g=8,01 kg
H=20
Pp=(a+b):2 ×h
Pp = (8+10):2×5
Pp= 18 :2 ×5
Pp = 9×5
Pp= 45 cm²
V= 45×20
V=900cm³
900 × 8,9g = 8010g
Odp. Ciezar tej sztabki wynosi 8010 g ; )