Concept

Parallel lines:

Lines that do not meet.

Perpendicular lines:

Two lines that meet at a right angle.

Intersecting lines:

Two lines that share exactly one point.

Rule

To figure out if lines are parallel, perpendicular, or intersecting:

1. If the lines run alongside each other, but never meet, they are parallel. The symbol for parallel is ∥
2. If the lines meet at a right angle (90°), they are perpendicular. The symbol for perpendicular is ⊥
3. If the lines meet (but not at a right angle) and share one point, they are intersecting.

Example

Select the correct statement.

Solution

The lines do not meet. Therefore, they are parallel.

Pre-requisite Skills

Identify Three Dimensional Figures (4.8.1)

Faces, Edges, and Vertices (4.8.2)

Nets of 3 Dimensional Figures (4.8.3)

Simple Polygons (4.9.1)