tolong dijawab segera.. butuh banget

[tex] {kl}^{2} = {ok}^{2} - {ol}^{2} \\ {kl}^{2} = {13}^{2} - {5}^{2} \\ {kl}^{2} = 169 - 25 \\ {kl}^{2} = 144 \\ kl = \sqrt{144} = 12[/tex]