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Pp=a*h/2=3*8/2=12 cm²
H=20 cm
V=Pp*H=240 cm³
Pp = 1/2 a * h
Pp = 1/2 8 * 3
Pp = 4 * 3
Pp = 12cm2
V= Pp * H
V= 12 * 20
V= 240 cm3