Definition of Perpendicular Lines | MathHelp.com - By MathHelp.com
Transcript
| 00:00 | Using the diagram shown , The definition of perpendicular lines | |
| 00:06 | states that if line A B is perpendicular to line | |
| 00:11 | C . D . Then angle A . X . | |
| 00:14 | D . Is a right angle , or the measure | |
| 00:18 | of angle A XT equals 90 degrees . Note that | |
| 00:23 | the symbol we use for perpendicular lines is an upside | |
| 00:27 | down T . Shown here . So if these two | |
| 00:32 | lines are perpendicular , then we can put a box | |
| 00:37 | at the vertex of the angle A . XD . | |
| 00:41 | Which tells us that angle A XD is a right | |
| 00:45 | angle , and if line A B is perpendicular to | |
| 00:50 | line C . D . Then angle B . X | |
| 00:53 | . D , angle B , X . C . | |
| 00:57 | And angle A XC are also right angles . Finally | |
| 01:04 | , the definition of perpendicular lines can also be stated | |
| 01:09 | the other way around . If angle A XD is | |
| 01:14 | a right angle Or the measure of Angle AXD is | |
| 01:18 | 90° , then we know that line A B is | |
| 01:23 | perpendicular to line C . D . |
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