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Autor: ZadanieDomowe Dodano: 24.11.2010 (22:36)
Ile należy zużyć blachy, żeby zrobić otwarte pudełko o wysokości 13 cm, w kształcie prostopadłościanu, którego podstawą jest prostokąt o wymiarach 14 cm i 12cm?
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priscila1 24.11.2010 (23:11)
Należy obliczyc pole całkowite tego pudełka. Pole podstawy + 4 pola boczne.
Pole podstawy= 14*12=168cm2
Pole boczne=12*13=156cm2
pole boczne=14*13=182cm2
168+2*156+2*182=844cm2 tyle potrzeba blachy na pudełkoDodawanie komentarzy zablokowane - Zgłoś nadużycie
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Melqa 24.11.2010 (22:59)
Pole prostokąta(podstawy)=a*b
Pp=14*12
Pp=168cm2
Pole boku=a*h
Pb=13*14
Pb=182cm2
Pb drugiego=a*h
Pb drugiego=13*12
Pb drugiego=156cm2
boków o tych samych polach jest 2x2 (bo sa 2 boki 13*12 i dwa boki 13*14)
a więc sumujemy: Pcałości = 168+(182*2)+(156*2)= 168+364+312
Pc=844cm2
Odp. Trzeba użyć 844cm2 blachy.
Obliczałam w pamięci i tak przynajmniej to kojarze, ale nie daje 100% pewności, że to jest dobrze.
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