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II bok= 12+2=14cm
III bok = 14+2=16 cm
O=12+14+16=42cm.
b=12cm+2cm=14cm
c=14cm+2cm=16cm
Obw=a+b+c
Obw=12cm+14cm+16cm=42cm [4,4dm]
Obwod tego trojkata wynosi 42cm.
Ob= 12cm + (12cm+2cm) + (12cm +2 cm) = 12cm + 14 cm + 14cm= 4cm
40cm=4dm