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What is an Oblique Line?

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  • 0:03 Leaning Tower of Pisa
  • 0:41 Oblique Lines Are Not Parallel
  • 1:07 Oblique Lines Are Not…
  • 1:40 Oblique Lines Are Slanted
  • 2:18 Lesson Summary
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Lesson Transcript
Instructor: Mark Boster
In this lesson, you'll learn about a special kind of a line called an oblique line and how it differs from other types of lines. You'll also find out what oblique lines have to do with the Leaning Tower of Pisa!

Leaning Tower of Pisa

Have you ever heard of the Leaning Tower of Pisa? It is a tower in Pisa, Italy, that was built hundreds of years ago. Over the years it began to lean. If people built that tower today, they might call it the Oblique Tower of Pisa. Why? Because it's oblique.

When there are any two lines on the same plane, which is a mathematical word for surface, there are only three ways they can be related: parallel, perpendicular or oblique. Remember that a line goes in both directions forever. In order to understand what an oblique line is, you have to know what it is not.

Oblique Lines Are Not Parallel

The first way two lines on the same plane can relate to each other is by being parallel: that means that the two lines will never cross. They are also the same distance from each other, like the rails on railroad tracks. This is pretty easy to remember since all the letter Ls in the word 'parallel' are parallel! Remember, parallel lines never meet. They don't have to be drawn next to each other either. Don't let the purple ones in this diagram fool you.

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