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a=6cm
h₁=18cm²/6cm=3cm
33⅓%=⅓
h₂=6cm*⅓=2cm
b=18cm²/2cm=9cm
Ob=2a+2b
Ob=2*6cm+2*9cm
Ob=12cm+18cm
Ob=30cm
1 dm²=100 cm²
P=0,18*100 cm²=18 cm²
b=6cm
h= 33,3 % *b
h=0,333*6= 2 cm
P=a*h
18=a*2
a=9
Ob=2a+2b
Ob=2*9+2*6=18+12=30