Oblicz pole powierzchni prostopadłościanu o wymiarach:
a.1m x 6m x 7m
b. 4cm x 4cm x 7 cm
c. 11cm x 9cm x 3cm
d. 3m x 1 dm x 2m
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a)
P=2ab+2bc+2ac=2*1*6+2*6*7+2*1*7=12+84+14=110[mkw]
b)
P=2*4*4+2*4*7+2*4*7=32+56+56=144[cmkw]
c)
P=2*11*9+2*9*3+2*11*3=198+54+66=318[cmkw]
d)
1dm=0,1m
P=2*3*0,1+2*0,1*2+2*3*2=0,6+0,4+12=13[mkw]
a) Pp= 1m*6m*2 = 12 m 2
Pb= 6m*7m*2+1m*7m*2=84m2 + 14m2= 98m2
Pc= 12m2+98m2=110m2
b) Pp=4cm*4cm*2=32cm2
Pb=4cm*7cm*4=112cm2
Pc=112cm2+32cm2=144cm2
c) Pp=9cm*3cm*2=54cm2
Pb=9cm*11cm*2+3cm*11cm*2=188cm2+66cm2=254cm2
Pc=254cm2+54cm2=308cm2
d) 1dm= 0,1m
Pp= 0,1m*2m*2= 0,4m2
Pb=3m*2m*2+0,1m*3m*2=12m2+0,6m2=12,6m2
Pc=12,6m2+0,4m2=13m2
m2-metry kwadratowe
* = znak mnożenia