Odpowiedź:
[tex] {x}^{2} = {12}^{2} + {18}^{2} \\ {x}^{2} = 144 + 324 \\ {x}^{2} = 468 \\ x = \sqrt{468} \\ x = \sqrt{117 \times 4} \\ x = 2 \sqrt{117} [/tex]
[tex] {x}^{2} = {9}^{2} + {12}^{2} \\ {x}^{2} = 81 + 144 \\ {x}^{2} = 225 \\ x = \sqrt{225} \\ x = 15[/tex]
[tex] {x}^{2} = {5}^{2} + {12}^{2} \\ {x}^{2} = 25 + 144 \\ {x}^{2} = 169 \\ x = \sqrt{169} \\ x = 13[/tex]
