If D=25 use information in the figure below to determine angle F

Answer:
130°
Step-by-step explanation:
DEF is an isosceles triangle with base DE and DF = EF.
By definition, base angles of an isosceles triangle are equal.
Hence ∠FDE = ∠DEF = 25°
Angle F = 180° - ∠FDE - ∠DEF
= 180° - 25° - 25°
= 130°