Respuesta :

12. x^2 + 5^2 = 13^2

x^2 + 25 = 169
-25 -25
————————
x^2 = 144

x = 12


13. 9^2 + 12^2 = 15^2

81 + 144 = 225

225 = 225

Yes, this is a right triangle.


14. 9.6^2 + 18^2 = 20.1^2

92.16 + 324 = 404.01

416.6 = 404.01

No, this is not a right triangle.