a)
V = Pp * h
Pp = a * h
Pp = 8 cm * 6 cm = 48 cm^2
V = 48 cm^2 * 12 cm
V = 576 cm^3
b)
V = Pp * h
Pp = a * h /2
Pp = 3 dm * 4 dm /2 = 6 dm^2
V = 6 dm^2 * 2 dm
V = 12 dm^3
c)
V = Pp * h
Pp = (a + b) * h /2
Pp = (2m + 4m) * 3m /2 = 9 m^2
V = 9 m^2 * 1,5 m
V = 13,5 m^3
Mam nadzieję, że pomogłem :)