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a=8cm
b=17cm
O=a+2b
O=8+2*17 =8+34
O=42cm
2.
a=5
b=6
c=9
a'/a =k =12,5/5
k=2,5
b'=b*k =6*2,5
b'=15
c'=c*k =9*2,5
c'=22,5