Two unique lines intersecting each various other at 90° or a ideal angle are called perpendicular lines.

You are watching: Two lines that intersect at right angles

**Example**:

Here, abdominal is perpendicular to XY because ab and XY crossing each various other at 90°.

**Non-Example:**

The two lines are parallel and also do no intersect every other. They have the right to never it is in perpendicular to each other. | The two lines space intersecting each other at an acute angle. So, they room not perpendicular. | The lines are not intersecting each various other at appropriate angles. |

**Properties that perpendicular lines**

These lines constantly intersect at best angles.

If two lines space perpendicular to the same line, they are parallel to every other and will never ever intersect.

Adjacent sides of a square and also a rectangle are constantly perpendicular to every other.

Sides of the right-angled triangle enclosing the appropriate angle are perpendicular to every other.

**Real life examples**

We have the right to observe countless perpendicular currently in actual life. Some instances are corner of 2 walls and the Red overcome symbol.

The indigenous ‘perpendicular’ has actually its origin from the late center English i beg your pardon exactly means “at ideal angles”, from Latin ‘perpendicularis’, ‘perpendiculum’ meaning “plumb line” and also from ‘perpendere’ wherein ‘per’ method “through” and ‘pendere’ method “to hang”. The perpendicular lines are always intersecting lines but intersecting lines room not always perpendicular to each other. |