Answer:
x=6 cm
Step-by-step explanation:
As given in the question that ABCD is congruent to EFGH.
We can say that,
AD <-----> EH {Corresponding Parts Of Congruent Polygons}
AD=EH
We are given that,
[tex]AD=9\\EH=(2x-3)\\Hence,\\As\ AD=EH\\9=2x-3\\9+3=2x\\12=2x\\x=6[/tex]
