lesson
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Look around your room β the floor stretches flat, the walls stand straight up, and the roof outside slants down. Lines do the exact same thing!
The direction a line points is called its orientation. In math, every straight line points in one of three main directions.
What do we call a line that stretches straight across from left to right?
Horizontal Lines
A horizontal line goes straight across from left to right, completely flat.
The word comes from the horizon β the flat line in the distance where the ocean water meets the sky.
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What happens when a line stands straight up instead of lying flat?
Vertical Lines
A vertical line goes straight up and down without leaning to either side.
Think of a tall flagpole, a skyscraper, or a tree standing straight up toward the clouds.
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What if a line is tilted β neither flat nor straight up and down?