Respuesta :

use Pythagoras Theorem
[tex] {a}^{2} + {b}^{2} = {c}^{2} [/tex]
So

[tex] {18}^{2} + {24}^{2} = 900[/tex]
[tex] {c}^{2} = 900 \\ c = \sqrt{900} \\ c = 30[/tex]