ABC is congruent to DEF.
AB = DE....so....
3x + 8 = 5x
8 = 5x - 3x
8 = 2x
8 / 2 = x = 4
Angle D = Angle A.....so....
5y + 11 = 6y + 2
11 - 2 = 6y - 5y
9 = y
Angle D = 6y + 2 = 6(9) + 2 = 56
So
Angle F = 180 - 56 - 83 = 41°
EF = BC = 25 in
