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Parallel Lines

Lines are parallel if they are always the same distance apart (called "equidistant"), and will never meet. Just remember:

Always the same distance apart and never touching.

The red line is parallel to the blue line in each of these examples:

Parallel lines also point in the same direction.

Parallel lines have so much in common. It's a shame they will never meet!

Try it yourself:

Pairs of Angles

When parallel lines get crossed by another line (which is called a Transversal), you can see that many angles are the same, as in this example:

These angles can be made into pairs of angles which have special names.

Click on each name to see it highlighted:

Now play with it here. Try dragging the points, and choosing different angle types. You can also turn "Parallel" off or on:

images/geom-line-para.js?mode=corr

Testing for Parallel Lines
Some of those special pairs of angles can be used to test if lines really are parallel:

Examples

813, 814, 1783, 3298, 815, 816, 1784, 1785, 3299, 3300

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Lines are parallel if they are always the same distance apart (called "equidistant"), and will never meet. Just remember: The red line is parallel to the blue line in each of these examples: Parallel lines also point in the same direction. Parallel lines have so much in common.

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Millionaire Game
Quizlet
Angle Relations # 1
Angle Measurements # 1
Angle Relationships # 2
Angle Relationships # 3
Angle Relationships # 4

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Write the name of side "C" on the upper corner of your test.

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Learn for free about math, art, computer programming, economics, physics, chemistry, biology, medicine, finance, history, and more. Khan Academy is a nonprofit with the mission of providing a free, world-class education for anyone, anywhere.

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Learn about parallel lines, transversals, and the angles they form.