Question

a square has a side lengths of 9, use the pythagorean theorem to find the length of the diagonal

Answer 1

The diagonal length is 12.73 units

Answer 2

${a}^{2} + {b}^{2} = {c}^{2} \\ {9}^{2} + {9}^{2} = {c}^{2} \\ {81} + 81 = {c}^{2} \\ 162 = {c}^{2} \\ \sqrt{162} = \sqrt{ {c}^{2} } \\ 12.73 = c$
the length of the diagonal is 12.73