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b=8cm:2=4cm
c=8cm+1,5cm=9,5cm
O=a+b+c
O=8+4+9,5
O=21,5cm
II bok-8 cm : 2 = 4 cm
III bok-8 cm+ 1,5 cm=9,5 cm
Obw: 8 cm+ 4 cm+ 9,5 cm =21,5 cm