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दर्शाइए कि घन का फलक विकर्ण `sqrt(2) a` होता है, जहां a किनारे की लंबाई है |

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नीचे दर्शाये गये चित्र से स्पष्ट है कि- फलक विकर्ण,
`AC=sqrt(AD^2+CD^2)`
`sqrt(a^2+a^2)`
`=sqrt(2)a`
`(because AD = CD +a )`
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