Geometry

Question Analysis:
This question extends congruency to polygons beyond triangles.

Key Concept Explanation:
For any polygon, congruency requires both sides and angles to match.
Example: A rhombus and a square have equal sides but different angles.

Step-by-Step Solution:
Triangles: SSS ensures congruency.
Quadrilaterals+: Sides alone are insufficient (angles must match).

Option Analysis:
A) Incorrect (angles matter).
B) Correct (full side-angle correspondence needed).
C) Incorrect (only triangles allow side-only congruency).
D) Incorrect (regularity doesn’t guarantee congruency unless all properties match).

Common Mistakes:
Assuming quadrilaterals follow the same rules as triangles.

Summary：
For two polygons to ...