Similar triangles

Triangle A'B'C 'is similar to triangle ABC, whose sides are 5 cm, 8 cm, and 7 cm long. What is the length of the sides of the triangle A'B'C ' if its circumference is 80 cm?

Correct result:

a =  20 cm
b =  32 cm
c =  28 cm


A=5 cm B=8 cm C=7 cm  o1=A+B+C=5+8+7=20 cm o2=80 cm  k=o2/o1=80/20=4  a=A k=5 4=20 cm
b=B k=8 4=32 cm
c=C k=7 4=28 cm

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