Geometric Pattern Analysis: Identifying Common Properties in Four Line Configurations

Let's remember that perpendicular lines are lines that form a 90-degree angle with each other.

Parallel lines are lines that will never intersect and do not form any angle between them.

In order to examine the types of angles that lines form with each other, we will draw a T at the intersection point of the lines in the following way:

Note that from the drawings we can see that what they all have in common is the right angle, which means that all the lines are perpendicular.