## Collinear

### In mathematics, the term “collinear” refers to a set of points that lie on the same straight line

In mathematics, the term “collinear” refers to a set of points that lie on the same straight line. More specifically, it means that three or more points are positioned in such a way that if you were to draw a line through any two of them, the line would pass through the remaining points as well.

To determine if a set of points is collinear, you can use a simple test called the collinearity test. This test involves calculating the slopes between pairs of points and checking if they are equal. If all the slopes are equal, then the points are collinear.

For example, let’s say we have three points A, B, and C. To check if they are collinear, we can calculate the slopes of the lines AB, BC, and AC. If the slopes of AB, BC, and AC are all equal, then points A, B, and C are collinear. However, if even one of the slopes is different, then the points are not collinear.

The concept of collinearity is widely used in various areas of mathematics, especially in geometry and coordinate geometry. It helps in determining properties of lines and shapes, and plays a crucial role in the study of parallel lines, perpendicular lines, and other geometric relationships.

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