A line in modern geometry is defined as a one-dimensional figure that extends in both directions.
The line can be categorized into:
- The vertical line in a coordinate plane is defined as the line parallel to Y-axis. It is the line that extends in both directions from to bottom. It is generally referred to as a standing line.
- The horizontal line in a coordinate plane is defined as the line parallel to X-axis. It is the line that extends in both directions from left to right. It is generally referred to as a sleeping line.
Thus, a horizontal line look likes a line drawn from left to right.
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