The answer will depend on what x is and what ab and ad are. And since you have not bothered to provide the information, I cannot provide a more useful answer.
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If the problem is (5x+1) and your trying to figure out X. The answer is 12. (APEX)
to lines that r the same length
No, triangles with the same side lengths are always congruent.
No because you can cut from diffetent angles That would make the side noncongruent
Polygon