2 MATH Questions!

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<p>Check this </p>

<p><a href=“A diagonal in a cube”>http://mathcentral.uregina.ca/QQ/database/QQ.09.04/brett1.html&lt;/a&gt;&lt;/p&gt;

<p>Fwiw, it is not a bad idea to know the formula for the diagonal of a cube. </p>