H-A case of congruency of two right triangles

Question 1

Prove that <ACB = < DFE

Question 2

Prove that the two triangles ABC and DEF are congruent.

Question 3

What can you deduce about the congruency of two [b][color=#ff0000]right [/color][/b]triangles? [br]What are the conditions needed to prove two [color=#ff0000][b]right [/b][/color]triangles congruent?

Information: H-A case of congruency of two right triangles