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If (2, 1), (2, 5) are opposite corners of a square then the length of its side is

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$2 \sqrt{2}$

$\sqrt{2}$

answer is B.

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Detailed Solution

$2 x^{2} = (2 - 2)^{2} + (1 - 5)^{2} \Rightarrow 2 x^{2} = 16 \Rightarrow x = 2 \sqrt{2}$

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