Answer:
LG
Explanation:
If polygon ABCDEF is congruent to polygon JIHGLK, then the congruent sides are:
[tex]\begin{gathered} AB\cong JI \\ BC\cong IH \\ CD\cong HG \\ DE\cong GL \\ EF\cong LK \end{gathered}[/tex]Thus, we have that if:
[tex]DE\cong GL[/tex]Then reversing the order:
[tex]ED\cong LG[/tex]Side length ED is congruent to LG.