Oblicz pole powierzchni prostopadłościanu o wymiarach : C)1cm x 9 cm x 3cm d)3m x 1dm x 2m

1cm x 9 cm x 3cm 2*1cm*3cm + 2*9cm*3cm + 2*1cm*9cm = 6cm+54cm+18cm = 78cm2 3m x 1dm x 2m 3m=30dm 2m=20dm 2*30dm*20dm + 2*10dm*20dm + 2*30dm*10dm=1200dm+400+600=2200dm2 myślę, że pomogłam :)

c) P= 2ab+2bc+2ac P=2×1×9 + 2×9×3 + 2×1×3 = 18 + 54 +6 = 78 [cm²] d) P= 2ab + 2bc + 2ac 3m = 30 dm 1 dm 2m = 20 dm P= 2×30×1 + 2×1×20 + 2×30×20 = 60 + 40 + 1200 = 1300 [dm²]

C) a = 1 cm b = 9 cm c = 3 cm P = 2ab + 2bc + 2ac P = 2*1*9 + 2*9*3 + 2*1*3 P = 78[cm²] d) a = 3 m = 30 dm b = 1 dm c = 2 m = 20 dm P = 2ab + 2bc + 2ac P = 2*30*1 + 2*1*20 + 2*30*20 P = 60 + 40 + 1200 P = 1300[dm²]