Answer :

sahana0805
The diagonal length is 12.73 units

[tex]{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[/tex]
the length of the diagonal is 12.73

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