# Category:Straight Lines

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This category contains results about **Straight Lines**.

Definitions specific to this category can be found in Definitions/Straight Lines.

In the words of Euclid:

*A***straight line**is a line which lies evenly with the points on itself.

## Subcategories

This category has the following 8 subcategories, out of 8 total.

## Pages in category "Straight Lines"

The following 30 pages are in this category, out of 30 total.

### A

### C

- Characteristic of Quadratic Equation that Represents Two Straight Lines
- Condition for Concurrency of Three Straight Lines
- Condition for Homogeneous Quadratic Equation to describe Perpendicular Straight Lines
- Condition for Quadratic Equation to describe Perpendicular Straight Lines
- Condition for Straight Lines in Plane to be Parallel
- Condition for Straight Lines in Plane to be Perpendicular

### H

- Homogeneous Quadratic Equation for Straight Lines Parallel to those Passing through Origin
- Homogeneous Quadratic Equation representing Coincident Straight Lines
- Homogeneous Quadratic Equation representing Imaginary Straight Lines
- Homogeneous Quadratic Equation represents Two Straight Lines through Origin