Zadanie 9 str. 149 podręcznik klasa 6!!!!!
Oblicz pola powierzchni prostopadłościanów o wymiarach :
a) 4m x 7m x 2m
b)2 cm x 4,5 cm x 3,5
c) 11 dm x 11 dm x 11 dm
d) 25 mm x 4,7 cm x 0,2 dm
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a) 2*4m*7m + 2*4m*2m + 2*7m*2m=56m+16m+28m=100m
b) 2*2cm*4,5cm+2*2cm*3,5cm+2*4,5cm*3,5cm=18cm+14cm+31,5=63,5cm
c) 2*11dm*11dm+2*11dm*11dm+2*11dm*11dm=3*242dm=726dm
d) 2*2,5cm*4,7cm+2*2,5cm*2cm+2*4,7cm+2cm=23,5cm+10cm+18,8cm=52,3cm