oblicz pola powieszchni prostopadłośćianów o wymiarach :
a) 4m x 7m x 2m
b) 2cm x 4,5cmx3,5cm
c) 11dm x 11dm x 11dm
d) 25mm x 4,7cm x 0,2dm
dam naj
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Pc=2ab+2bH+2aH
a]
P=[2*4*7]+[2*7*2]+[2*4*2]=56+28+16=100 m^3
b]
P=[2*2*4,5]+[2*4,5*3,5]+[2*2*3,5]=18+31,5+14=63,5 cm^3
c]
P=[2*11*11]+[2*11*11]+[2*11,11]=242*3=726 dm^3
d]
25 mm=2,5 cm
0,2 dm=2 cm
P=[2*2,5*4,7]+[2*4,7*2]+[2*2*2,5]=23,5+18,8+10=52,3 cm^3
a)
4m×7m×2m
Ppc=4m·7m·2+4m·2m·2+7m·2m·2=56m²+16m²+28m²=100m²
b)
2cm×4,5cm×3,5cm
Ppc=2cm·4,5cm·2+2cm·3,5cm·2+4,5cm·3,5cm·2=18cm²+14cm²+31,5cm²=63,5cm²
c)
11dm×11dm×11dm
Ppc=6·11dm·11dm=726dm²
d)
2,5cm×4,7cm×2cm
Ppc=2,5cm·4,7cm·2+2,5cm·2cm·2+4,7cm·2cm·2=23,5cm²+10cm²+18,8cm²=52,3cm²