What is a horizontal line? Definition
A horizontal line is a line that travels from left to right across the page. This is because horizontal lines are parallel to the horizon. This fact can help children to remember the meaning of horizontal lines.
What is a vertical line?
A vertical line goes up to down. So if you draw a horizontal line and a vertical line that intersect, they are perpendicular to each other.
Examples of horizontal lines
You can see horizontal lines all around you.
If you look out at sea from the shore, you will see the horizon where the sea meets the sky. Likewise, you lie horizontally when you lie flat on your bed or the sofa.
You can also find horizontal line segments in lots of different polygons. For example, several quadrilaterals have two horizontal lines. These include squares and rectangles.
