Ratio of areas of similar figures gives ratio of radii or perimeters

This type of question, asked 2 times: CDS 1 2017, CDS 2 2020. All 2 questions below, oldest first.

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Question 1
CDS 1 2017
74 $The areas of two circular fields are in the ratio 16 : 49. If the radius of the bigger field is 14 m, then what is the radius of the smaller field ?$
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Question 2
CDS 2 2020
84 $m^2 : n^4$
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