Sides of the triangle

The sides of the triangle ABC have a length of 4 cm, 5 cm, and 7 cm. Construct triangle A'B'C', similar to triangle ABC, which has a circumference of 12 cm.

Correct answer:

a =  3 cm
b =  3.75 cm
c =  5.25 cm

Step-by-step explanation:

a1=4 b1=5 c1=7 o1=a1+b1+c1=4+5+7=16 o2=12 k=o2/o1=12/16=43=0.75 a=a1 k=4 0.75=3 cm
b=b1 k=5 0.75=3.75 cm
c=c1 k=7 0.75=5.25 cm

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