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obwód= 2x20cm + 2 x 10 cm= 60 cm
P=a*b=20cm*10cm==200cm²
P=a x b
P=20cm x 10cm=
P=200cm
Obwód:
Obw=(a x 2) + (b x2)
Obw=(20cm x 2) + (10cm x 2)= 40cm + 20cm=60cm
Obw=60cm