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The ratio of 25-ft to 20-ft is 5/4 or 1.25 .

But ... knowing the perimeters alone is not enough information

to guarantee that the two figures are similar.

-- They could be two rectangles, one measuring 25-ft by 1-ft, the other measuring 4-ft by 5-ft.

Those are not similar rectangles.

-- They could even be one rectangle and one triangle ... definitely not similar.

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Q: What is the similarity ratio of the perimeters of 25ft and 20ft?
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