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l=2,5m
z pitagorasa obliczam h stożka
h²=l²-r²
h²=2,5²-2²
h²=6,25-4
h²=2,25
h=1,5m
v=⅓πr²h=⅓π×2²×1,5=⅓×3,14×6=6,28m³
1m³waży 3 tony
6,28m³ waży 6,28×3=18,84 tony waży stos żwiru