**Definition of Collinear **

- Three or more points that lie on the same straight line are called to be Collinear.

**More about Collinear**

- Three points
*(x*, where_{i}, y_{i}, z_{i})*i*= 1, 2, 3, are collinear if*x*_{2}- x_{1}: y_{2}- y_{1}: z_{2}- z_{1}= x_{3}- x_{1}: y_{3}- y_{1}: z_{3}- z_{1}.

**Example of Collinear**

- In the above diagram, the points P, Q, and R are collinear.

**Solved Example on Collinear**

Determine the points that are collinear in the following diagram.

Choices:

A. A, B, F

B. A, B, C, D

C. A, B, C, D, E, F, G

D. E, F, G

Correct Answer: B

Solution:

Step 1:Three or more points that lie on the same straight line are called collinear.

Step 2:In the above diagram, points A, B, C, D lie on the same straight line.

Step 3:So, the points A, B, C, D are collinear.

**Related Terms for Collinear**

- Line
- Point
- Straight line