Geometry

Question Analysis:
This question involves angle bisection in a rhombus.
The main focus is on how diagonals split angles in rhombuses.

Key Concept Explanation:
Each diagonal in a rhombus bisects the vertex angle it connects to.
So, if ∠DAB = 40°, diagonal AC splits it into two equal parts.

Step-by-Step Solution:
x = ∠EAB = ½ × ∠DAB = ½ × 40° = 20°

Common Mistakes:
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