Search IntMath
Close

450+ Math Lessons written by Math Professors and Teachers

5 Million+ Students Helped Each Year

1200+ Articles Written by Math Educators and Enthusiasts

Simplifying and Teaching Math for Over 23 Years

# What are Collinear Points?

Geometry is the branch of math that deals with shapes, sizes, and measurements. In geometry, a collinear point is a point that lies on the same straight line as two or more other points. Collinear points can be used to make constructions and solve problems in geometry. Let’s dive into what collinear points are and how they work.

## How Collinear Points Work

To understand what collinear points are, it’s important to understand algebraic equations. An algebraic equation is a mathematical expression written in terms of an unknown variable or variables used to represent certain values. In geometry, we use these equations to represent lines and slopes. A line consists of multiple collinear points that all lie on the same line when graphed on an x-y plane.

The equation for a line consists of two variables—the slope (m) and the y-intercept (b). The slope represents the steepness of the line while the y-intercept represents where the line crosses the y-axis. The equation for a line is “y = mx + b”; any three points that satisfy this equation are said to be collinear because they all lie on the same line when graphed together. For example, if you have three points (3, 8), (5, 10), and (7, 12), they would all be collinear because they satisfy the equation “y = 2x + 4”.

The concept of collinearity can also be applied to shapes such as triangles and polygons; any three or more points that lie on the same line are said to be collinear within that shape. For example, in a triangle ABC with vertices at A(2,-4), B(6,-2) and C(-2,-1), all three vertices would be considered collinear because they lie on the same straight line when graphed together. This helps us identify certain properties about these shapes such as angles and lengths of sides without having to calculate them manually every time.

## Conclusion:

Collinear points are an essential part of geometry since they help us identify properties about shapes like angles and side lengths without having to calculate them manually every time. They can also help us make constructions in geometry such as drawing perpendicular lines between two given lines or constructing parallel lines through a given point outside it. Understanding what collinear points are and how they work is critical for students studying geometry!

## FAQ

### What is collinear points in geometry?

Collinear points are points that lie on the same straight line when graphed together. All three or more points that lie on the same line when graphed together are said to be collinear, and they can help us identify certain properties of shapes such as angles and side lengths without having to calculate them manually every time.

### What are 3 collinear points?

Three collinear points are three points that all lie on the same straight line when graphed together. Examples of three collinear points could be (3, 8), (5, 10), and (7, 12). These collinear points all satisfy the equation “y = 2x + 4”, meaning they all lie on the same line when graphed together.

What is the equation for a line?

The equation for a line consists of two variables—the slope (m) and the y-intercept (b). The equation for a line is “y = mx + b”, and any three points that satisfy this equation are collinear because they all lie on the same line when graphed together.

### How do you prove points are collinear in geometry?

To prove that points are collinear, you need to find the equation of the line they lie on. This can be done by finding the slope and y-intercept of the line and then plugging in the coordinates of each point to make sure they all satisfy the equation. If they do, then those points are considered collinear. Additionally, points can also be proven to be collinear by constructing perpendicular or parallel lines between them. If the constructed lines intersect at a single point, then that proves those points are collinear.

### What is the rule of collinear points?

The rule of collinear points is that any three or more points that lie on the same line when graphed together are considered collinear. This means they satisfy the equation “y = mx + b”, where m and b are the slope and y-intercept, respectively. Additionally, points can also be proven to be collinear by constructing perpendicular or parallel lines between them. If the constructed lines intersect at a single point, then that proves those points are collinear.