Geometry

Question Analysis

This question involves the concept of parallel planes in geometry, with an application to real-life scenarios. The main focus is on understanding the characteristics and properties of parallel planes and differentiating them from other types of plane relationships such as intersecting and perpendicular planes.

Key Concept Explanation:

Parallel planes are defined as planes that do not intersect each other, regardless of how far they are extended. In contrast, intersecting planes meet at a line.

Option Analysis

Option B describes parallel planes.

The other options are incorrect:

Option A: The pages of an open book intersect along the spine, so they are not parallel planes.

Option C: The floor and a wall form a 90° angle at the baseboard, so they are not parallel planes.