Geometry

Question Analysis

This question explores the practical applications of parallel lines. The focus is on identifying real-world scenarios where correctly utilizes the property of parallel lines.

Key Concept Explanation:

Parallel lines are defined as coplanar lines that do not intersect each other, no matter how far they are extended.

Option Analysis

The correct answer is B: To design railroad tracks. The two rails of a railroad track are parallel to each other. This ensures that the wheels of the train can move smoothly along the tracks. If the rails were not parallel, the train would derail.

The other options are incorrect:

Option A: Perpendicularity requires right angles, not parallelism.