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Perimeters of two similar triangles and one side given: the corresponding side

The same question, asked 2 times: 17 Jul 2023 S1*, 13 Sep 2024 S3. Every wording below, oldest first.

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  1. Question 1

    17 Jul 2023 S1

    63
    ΔABC∼ΔDEF\Delta ABC \sim \Delta DEF and the perimeters of ΔABC\Delta ABC and ΔDEF\Delta DEF are 40 cm and 12 cm, respectively. If DE = 6 cm, then AB is:

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  2. Question 2

    13 Sep 2024 S3

    55
    The perimeters of two similar triangles ΔRST\Delta RST and ΔABC\Delta ABC are 26 cm and 39 cm, respectively. If AB = 24 cm, then RS is ___.

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