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b=2,5m
h=1m
¾h=¾×1m=0,75m
ilość piasku:
v=abh=3,5×2,5×0,75=6,5625m³ potrzeba piasku
3]
a=3,5cm
b=2,5cm
c=4,5cm
h=2cm
pole boczne=ah+bh+ch=3,5×2+2,5×2+4,5×2=7+5+9=21cm²
b=2,5m
h=1m
¾h=¾×1=0,75m
v=abh=3,5×2,5×0,75=6,5625m³ potrzeba piasku