Minta tolong beserta caranya yaa. Terima kasih. Materinya Teorema Pythagoras

[tex] {x}^{2} + {x}^{2} = {(18 \sqrt{2} )}^{2} \\ 2 {x}^{2} = {(18 \sqrt{2} )}^{2} \\ 2 {x}^{2} = 324 \times 2 \\ 2 {x}^{2} = 648 \\ {x}^{2} = \frac{648}{2} \\ {x}^{2} = 324 \\ x = \sqrt{324} \\ x = 18 \: cm[/tex]
Jadi Kel persegi = 4 x sisi
Kel = 4 x 18
Kel = 72 cm