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[tex]"20cm"[/tex]
[tex]Area\ of\ rq=a^2[/tex]
[tex]a=\sqrt{200}=10\bullet \sqrt{2}[/tex]
[tex]d\ iargul=\sqrt{2}9[/tex]
[tex]=10\times \sqrt{2}\times \sqrt{2}[/tex]
[tex]=20cm[/tex]
I hope this helps you
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