Triangle HEF is the image of triangle HGF after a reflection across line FH.
Select all statements that must be true.
1.) Segment EH is congruent to segment FG.
2.) Triangle EFH is congruent to triangle GFH.
3.) Triangle FGH is congruent to triangle FEH.
4.) Angle HFE is congruent to angle FHG.
5.) Angle EFG is congruent to angle EHG.
6.) Segment GH is congruent to segment EH.