Zad.1 Oblicz Pola powierzchni prostopadłościanówo wymiarach:
a.) 4m x 7m x 2m
b.) 2cm x 4,5cm x 3,5cm
c.) 11dm x 11dm x 11dm
d.) 2,5cm x 4,7 cm x 2cm
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a) 56 m
b)31,5 cm
C) 1331 dm
d)23,5 cm
a)
4m x 7m x 2m
P= 2ab + 2ac + 2bc
p= 2*4*7 + 2*4*2 + 2*7*2
P= 56 + 16 + 28
P= 100 m²
b)
2cm x 4,5cm x 3,5cm
p= 2*2*4,5 + 2*2*3,5 + 2*4,5*3,5
p= 18 + 14 + 31,5
P= 63,5cm²
c)
11dm x 11dm x 11dm
P = 2*11*11 + 2*11*11 + 2*11*11
P = 242 + 242 + 242
P = 726 dm²
d)
2,5cm x 4,7 cm x 2cm
P = 2*2,5*4,7 + 2*2,5*2 + 2*4,7 *2
P = 23,5 + 10 + 18,8
P = 52,3 cm²