Geometry

Question Analysis：
This question focuses on applying triangle congruence postulates.
Given the perpendicular and angle - bisecting conditions, the key is to match the information with the right postulate.

Key Concept Explanation：
ASA (Angle - Side - Angle) postulate: If two angles and the included side of one triangle are congruent to those of another, the triangles are congruent.

Step - by - Step Solution：
1. Since bisects , .
2. is common to both triangles ( and

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