Answer:
AAS Postulate.
Step-by-step explanation:
The AAS Postulate states that if 2 angles and a non-included side are congruent on both triangles, then the two triangles are equivalent.
In this case, the first Angle is: ∠B ≅ ∠D (Given, both are 90° in measurement)
For the side: Line BE ≅ line DE (Given)
∡BEA ≅ ∡DEC (Definition of Vertical Angles)
AAS Postulate is therefore used.
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