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H = 640cm3 : 128cm2 = 5cm
Odp.: Wysokość ostrosłupa wynosi 5 cm.
Pp*h=3V
h=3V/Pp
h=3*640/128
h=15 cm
640=⅓*128*H / *3
1920=128*H / : 128
H=15cm
Odp. wysokość wynosi 15 cm.