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P=2(ab+ac+bc)
P=2*(8*5+8*12+5*12)=2*(40+96+60)=2*196=392 cm²
b= 5cm
c= 12 cm
Pc=?
Pc= 2ab + 2ac + 2bc
Pc= 2* (8cm*5cm) + 2*(8cm*12cm) + 2* (5cm*12cm)=
=2* 40cm2 + 2* 96cm2 + 2* 60cm2= 80 cm2+ 192 cm2+ 120 cm2 = 392 cm2
Odp. Pole powierzchni prostopadłościanu wynosi 393 cm2.