A line of symmetry is a line that divides a form exactly in half. This shows that if you folded the object along the line, the two halves would match exactly.
A mirror placed along the line would not change the shape either. Four lines make up a square's symmetry.
Among other lines, DF is one.
As a ray, BC.
A line segment named BE.
AD and CF are two examples.
AD and DF are some examples.
What is an example of a parallel line?
No matter how far in either direction they may be extended, parallel lines are ones that are equally spaced apart from one another and never cross. For instance, parallel lines are represented by a rectangle's opposite sides.
On the other hand, two lines are said to be perpendicular if they cross each other at a 90° angle.
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