Similar triangles

In the triangle DEF is DE = 21cm, EF = 14.7cm, DF = 28cm. The triangle D´E´F´ is similar to the triangle DEF. Calculate the lengths of the sides of the triangle D´E´F´ if the similarity coefficient is one-seventh.

Correct answer:

f₂ =  3 cm
d₂ =  2.1 cm
e₂ =  4 cm

Step-by-step explanation:

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