Common Core Math Vocabulary

Perpendicular Lines - Definition with Examples

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What are perpendicular lines? 

In geometry, a branch of mathematics, perpendicular lines are defined as two lines that meet or intersect each other at right angles (90°). 

Perpendicular Lines

Perpendicular lines can be found everywhere around us, like at street intersections, in rectangular window panes.

  Fun Facts

  • Perpendicular lines are always intersecting lines; however, intersecting lines are not always perpendicular. 

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Perpendicular lines intersect at right angles,
They stand tall, and never do they dangle. 

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Give your children opportunities to observe perpendicular lines in objects or places around them, such as a tall tree on the ground, an electric pole on the pavement, railway intersection, corner of two adjacent walls and high buildings.

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