Geometry

Question Analysis

This question involves determining the number of pairs of parallel edges in a pyramid. The main focus is on applying the definition of parallel lines and understanding the geometric structure of a rectangular pyramid.

 

Key Concept Explanation:

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

 

Step-by-Step Solution:

In a rectangular pyramid:

The base (rectangle) has 2 pairs of parallel edges: AB∥CD, AD∥BC.

The lateral edges (from apex to base vertices) are not parallel (all converge at the apex): AE, BE, CE, DE all converge at E → No parallelism.