Geometry

Question Analysis:
Tests knowledge of corresponding sides in congruent triangles.

Key Concept Explanation:
Sides are congruent if their endpoints correspond.

Step-by-Step Solution:
L ↔ R, M ↔ S, N ↔ T.
LN ↔ RT.

Option Analysis:
B matches; others are incorrect mappings.

Common Mistakes:
One common error is to assume that the sides can be matched randomly without following the order of the vertices.
Another mistake is misidentifying the vertices that form the sides in question.

Summary：
To find the corresponding side in congruent triangles, pay attention to the order of the vertices in t...