The sides 5, 6, and 12 form a triangle is false. C will always be the biggest number because it is the hypotenuse, and the others numbers can either be A or B.

Hope this helps, now you know the answer and how to do it. HAVE A BLESSED AND WONDERFUL DAY! As well as a great Valentines Day! :-)
- Cutiepatutie ☺❀❤