Answer :- Point F' corresponds to point F.
Explanation :-
Given : Two isosceles triangles ΔFDE and ΔF'D'E', whose corresponding angles and side lengths are equal such that
∠F'=∠F=90°.....(1)
DF=D'F'
and EF=E'F'
⇒ ΔFDE ≅ ΔF'D'E' [by SAS postulate]
We know that corresponding parts of two congruent triangles are equal.
Thus Point F' corresponds to point F. .............. (from (1))
Therefore"point F." complete the given statement.