What’s the answer to this question?

Which triangle congruence postulate or theorem justifies my claim that the steps i made using construction paper and scissors produce an isosceles triangle? was it sss, sas, asa, aas, or hl?

Ineed in figuring out this problem.

If x is 6, then 7x= a. 13 b. 42 c. 42x d. 76