Answer:
Given that,

GH and JH are congruent.

IG and IJ are congruent.
The third side of the triangle GHI is HI and also for the triangle JHI is HI
HI is common for both the triangle GHI and triangle JHI.
we get,

By using SSS congrurnce criteria: SSS (Side – Side – Side) Congruence. If the three sides of one triangle are equal to the three sides of another triangle, then the two triangles are congruent.
we conclude that,

Hence proved.