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P=12*8
P=96 cm 2
V= jedna trzecia * pole podstawy * wysokość
V= jedna trzecia * 96 * 20
V= 640 cm sześciennych
V=1/3*Pp*H
a=12 cm
b=8 cm
H=20 cm
Pp=12*8=96 (cm2)
V=1/3*96*20=640 (cm3)