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Perimeters of similar triangles are in the ratio of their sides

This type of question, asked 2 times: CDS 1 2019, CDS 1 2021. All 2 questions below, oldest first.

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  1. Question 1

    CDS 1 2019

    39
    The perimeters of two similar triangles ABCABC and PQRPQR are 75 cm and 50 cm respectively. If the length of one side of the triangle PQRPQR is 20 cm, then what is the length of corresponding side of the triangle ABCABC ?

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  2. Question 2

    CDS 1 2021

    77
    △ABC\triangle ABC is similar to △DEF\triangle DEF. The perimeters of △ABC\triangle ABC and △DEF\triangle DEF are 40 cm and 30 cm respectively. What is the ratio of (BC+CA)(BC + CA) to (EF+FD)(EF + FD) equal to?

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