Geometry

Question Analysis:
This question asks about shared elements in overlapping triangles.
The main focus is on identifying common vertices, angles, and sides.

Key Concept Explanation:
Shared point: A vertex both triangles have
Shared angle: Same vertex and same two sides
Shared side: Exactly the same line segment

Step-by-Step Solution:
∠E: Only in △DEH → ❌ Not shared
∠D: Formed in both triangles at point D
Shared angle between △DEH and △DFG → ✅ Yes
∠F: Only in △DFG → ❌ Not shared
∠DGF: Only in △DFG → ❌ Not shared

Common Mistakes:
Thinking ∠DGF is shared—it’s not in △DEH
Conf...