Oblicz pola powierzchni prosopadłościanów o wymiarach:
a)4m x 7m x 2m
b)2cm x 4,5cm x 3,5cm
c)11dm x 11dm x 11dm
d)25mm x 4,7 cm x 0,2 dm
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4x7x2=28x2=56m3
2x4,5x3,5=9x3,5=35cm3
11x11x11=121x11=1331dm3
25x47x20=1175x20=23500mm3
a)P= 2*(4m*7m)+2*(4m*2m)+2*(7m*2m)=56 m2+16m2+28m2=100m2
b)P=2*(2cm*4,5cm)+2*(2cm*3,5cm)+2*(3,5cm*4,5cm)=18cm2+14cm2+15,75cm2=47,75cm2
c)P=6*(11dm*11dm)=726dm2
d)P=2*(2,5cm*4,7cm)+2*(2,5cm*2cm)+2*(2cm*4,7cm)=23,5cm2+10cm2+18,8cm2=52,3cm2