UPSKILL MATH PLUS

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A line may be a combination of points that extends infinitely in both directions. A line is labelled as sort of a line segment with a bidirectional arrow over the label.

The above figure shows a line $$AB$$ and is represented as $\stackrel{↔}{\mathit{AB}}$ or $\stackrel{↔}{\mathit{BA}}$.
Example:
$$100$$ metres track is to illustrate the concept of the line. A track may be a line that extends infinitely in both directions without having a fixed starting and ending point.
When three or more points lie on the same line they are called collinear points.

The above figure shows the collinear points $$A$$, $$B$$ and $$C$$. These points are collinear points because all three points lie on the same line.
Example:
Arrange the number of cups to validate the concept of the collinear points.
A ray is often defined as a straight line that starts from a point and extends indefinitely in one direction.
The starting point that is fixed at one end is termed as a vertex of a ray. Ray is an additionally one-dimensional entity as we will move endlessly in one direction alone.

The above figure shows a ray $$AB$$ and is represented as $\stackrel{\to }{\mathit{AB}}$.
Example:
We have a battery-operated torch on one end of the road and light from the torch (called a line segment) is travelling in a straight line towards the other direction. Since we don't know the end of that light, we will say that this line segment from a fixed source may be a ray.