#### Answer

The length of the diagonal is $L = \sqrt{2}~k$

#### Work Step by Step

We can use the Pythagorean theorem to find the length $L$ of the diagonal:
$L^2 = k^2+k^2$
$L = \sqrt{k^2+k^2}$
$L = \sqrt{2k^2}$
$L = \sqrt{2}~k$

Published by
Pearson

ISBN 10:
978-0-13-421743-7

ISBN 13:
978-0-13421-743-7

The length of the diagonal is $L = \sqrt{2}~k$

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