Geometry

Question Analysis：
This question tests the application of triangle congruence postulates in a rhombus context.
The key is to determine if the given info fits ASA.

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

Step - by - Step Solution：
1. Diagonal gives .
2. is the common (included) side for the angles in and

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