Answer: the last one
EXPLAINATION:
The first one follows the rule a+b=c, and when you add all the angles it equals 180
The second one when you add up all of the angles, it is 180
The third one follows a2+b2=c2. 5(5)+12(12)= 169, 13(13)=169
The last one does not follow any of the triangle rules.
