Question 916415
FGHI is a rectangle

In triangle FGH & triangle IHG

FG is congruent to HI ( opposite sides of rectangle)
Angle FGH is = angle IHG = right angle ( angles of a rectangle)
Side GH is common side

There fore triangle FGH is congruent to triangle IHG by (S A S test)

Therefore FH = IG

Hence proved