# One side of a square equals 13 inches. What is the length of the diagonal of the square?

$d \cong 18.3848 ' '$

#### Explanation:

${d}^{2} = {13}^{2} + {13}^{2}$

${d}^{2} = 338$

$d = \sqrt{338} \cong 18.3848 ' '$