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Nálevkou (lievik), ktorá má tvar rovnostranného kužeľa (prierez je rovnostranný trojuholník (dolný otvor zanedbajte) s priemerom 15 cm máme naplniť 25-litrový demižón. Koľkokrát musíme
lievik naplniť?
Koľko m2 pozinkovaného plechu sa spotrebuje na pokrytie strechy domu s obdĺžnikovým pôdorysom s rozmermi 10m a 8m, výškou strechy 5m, ak počítame s 5%-ým odpadom?
Aké množstvo materiálu treba na zhotovenie tienidla tvaru rotačného kužeľa s priemerom 1,2m a výškou 1,8m? Na záhyby pripočítajte 5% materiálu.
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