Wzór na pole powierzchni prostopadłościanu:
[tex]Pc = 2(ab+bc+ac)[/tex]
Prostopadłościan A:
[tex]a =5mm = 0,5cm\\b = 1cm\\c = 5cm\\\\Pc = 2(ab +bc+ac)\\Pc = 2(0,5cm \cdot 1cm + 1cm \cdot 5cm + 0,5cm \cdot 5cm) = 2 \cdot 8cm = \boxed{16cm^2}[/tex]
Prostopadłośćian B:
[tex]a = 2m = 20dm\\b = 4dm\\c = 5dm\\\\Pc = 2(ab+bc+ac)\\Pc = 2(20dm \cdot 4dm + 4dm \cdot 5dm + 20dm \cdot 5dm) = 2 \cdot 200dm = \boxed{400dm^2}[/tex]
