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b = 30:2 = 15 cm
Obw = 2a + 2b
Obw = 2*30 + 2*15
Obw = 60 + 30
Obw = 90 cm
Odp. Obwód prostokąta wynosi 90 cm.
szerokość - 30cm/2=15cm
Ob=2a+2b
15cm*2+30cm*2=90cm