The congruence statement indicates that both figures, in this case, triangles, are equal.
To write the congruence statement you have to make sure to write the corresponding vertices in the same order.
For the triangles you know that lines
AN=AW
GN=TW
And angles
∠N=∠W
Following these equalities, the congruence statement for these triangles is:
ΔAGN=ΔATW