Geometry

Question Analysis：
This question involves two overlapping triangles — △KMN and △NLM.
The main focus is on identifying shared sides and angles between the two triangles.

Key Concept Explanation：
To find the overlapping region, check:
Shared vertices (like point N or M)
Shared sides (like line MN)
Shared angles (angles formed at shared vertices)

Step-by-Step Solution：
△KMN and △NLM both include point N and point M
So line MN is a common side → ✅
Angle M appears in both triangles → ✅
Line KN is only in △KMN → ❌
Angle N exists in both triangles, but not necessarily the same angle. → ❌

Option Analysis：
A. Line MN ✅ — This is a shared side.
B. Line KN ❌ — Only in △KMN, not in both.
C. Angle M  ✅...