Verified answer

j'espère t'avoir aidé

[tex] {bc}^{2} = {ac}^{2} + {ab}^{2} \\ \: \: = {9}^{2} + {2}^{2} \\ \: = 81 + 4 \\ =85 \\ bc = \sqrt{85} \\ bc = 9.2[/tex]