Answer: (D) 40 cm
For a square of side s, diagonal = \(s\sqrt{2}\).
\[s\sqrt{2} = 10\sqrt{2} \Rightarrow s = 10\ \text{cm}\] \[\text{Perimeter} = 4 \times 10 = 40\ \text{cm}\]1 answer
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· 24 Oct 2026
AI-verified · Oct 2026
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