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b=12cm
c=16cm
O=a+b+c
O=8+12+16 = 36cm
O1=36-6
O1=30cm
O1/O=k =30/36
k=5/6
a1=a*k =8*5/6 =40/6 =6 2/3 cm
b1=b*k =12*5/6 =2*5=10cm
c1=c*k =16*5/6 =8*5/3 =40/3 =13 1/3 cm