square television screen has a side length of 10 inches. What is the approximate length of the diagonal of the television screen?

Jul 26, 2015

I found: $14 \text{in}$
${d}^{2} = {l}^{2} + {l}^{2} = 2 {l}^{2}$
$d = \sqrt{2 {l}^{2}} = l \sqrt{2} = 10 \sqrt{2} = 14 \text{in}$