I think all the triangles are congruent.   Here's the chain of reasoning:



A ≅ E    by ASA  (thus corresponding hypotenuses and corresponding vertical legs are equal length)



E ≅ C    by HL



C ≅ D    by SSS



D ≅ B    by SSS





Thus  A ≅ E ≅ C ≅ D ≅ B,  unless I missed something. 



To the other tutor, I think the x on B just implies the triangles are 90-45-45.  



------

C ≅ D:  Look at C, it is congruent to A (because C ≅ E, and E ≅ A, we can directly write C ≅ A), thus the vertical leg of C can be drawn with a single tick mark.  Now C and D can be seen to have all three corresponding sides of equal length.   



 

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