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zamieńmy na cm.
2dm=20cm
2mm =0,2 cm
p=a*h
0,2cm *20cm =4cm²
a = 2mm = 0,2 cm
b = 2dm = 20cm
P = 0,2 x 20 = 4cm^2
Odp : Pole wynosi 4cm^2 <Kwadratowych>