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/ - kreska ułamkowa
V=Pp * H
Pp= (a+b)*h/2
Pp= (3+6)*2/2
Pp=9 cm²
V=Pp * H
H= V : Pp
H = 108:9
H = 12 cm
a=3cm
b=6cm
h=2cm
(3+6)*2/2=9cm2
108/9=12cm
Odp.: Wysokość tego graniastosłupa wynosi 12 cm.