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If the ratio of the area of two square is 9 : 1 the ratio of their perimeters is?

9:1
3:1
3:4
1:3

Correct Answer: 3:1

Explanation:

Let the area of square be (9x)² m² and (x²) m²
Then, their sides are (3x) m and x metres respectively
∴ Ratio of their perimeters = 12x / 4x
=3:1

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