Answer:
Reflection of ΔGBC on side BC.
Explanation:
Transformation is the process by which the orientation or dimension of a given shape or figure is adjusted by some method of processes to produce an image with a required property.
From the given diagram, triangles ABC and GBC are congruent, so that;
AC ≅ GC
AB ≅ GB
BC is a common side to both triangles
Therefore, the appropriate transformation that would take ΔGBC onto ΔABC is reflection on side BC.