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500*1mm2=500mm2
1mm2=1mm*1mm=0,1cm*0,1cm=0,01cm2
500mm2=500*0,01cm2=5cm2
Łączna powierzchnia czubków wszystkich gwoździ to 5cm2
Zad.2
Pc= P₁-P₂
P₁=7m x 6m
P₁=42m²
P₂=2m x 2m
P₂= 4m²
Pc=42m²-4m²
Pc=38m²