Geometry

Question Analysis:
Tests understanding of congruency across shape types.

Key Concept Explanation:
Congruency requires identical shape and size.
Different types of polygons (e.g., right vs. equilateral triangles) cannot be congruent.

Step-by-Step Solution:
Eliminate options where congruency is possible:
A: Circles with the same radius are congruent.
B: Line segments with the same length are congruent.
D: Squares with the same side length are congruent.
C is correct because their angles and side relationships differ fu...