Vahan P. answered 05/12/22
Experienced high school math teacher and experienced musician
Given that you know that G is the midpoint of FH, you can deduce that FG = GH by definition of midpoint, even though it also states in the last statement that FG is congruent to GH. Since FI = GJ, FG = GH, and GI = JH by all of the given information, you can conclude that the triangles are congruent by SSS. When three pairs of sides in two triangles are congruent, the postulate states that the triangles are congruent.
Vahan