P = 2(ab + bc + ac)
a)
a = 1 cm
b = 4 cm
c = 5 cm
P = 2(1 cm x 4 cm + 4 cm x 5 cm + 1 cm x 5 cm) = 2(4cm2 + 20 cm2 + 5 cm2) = 2 x 29 cm2 = 58 cm2
b)
a = 2 dm
b = 2 dm
c = 5 dm
P = 2(2 dm x 2 dm + 2 dm x 5 dm + 2 dm x 5 dm) = 2( 4 dm2 + 10 dm2 + 10 dm2) = 2 x 24 dm2 = 48 dm2
Myślę, że tak będzie.