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a=8cm
b=4cm
c=6cm
a'=?
b'=7cm
c'=?
4cm-7cm
8cm-a'
a'=(8*7)/4=14cm
4cm-7cm
6cm-c'
c'=(6*7)/4=10,5cm
ObA'B'C'=a'+b'+c'=14+7+10,5=31,5cm