Lines of Symmetry | MathHelp.com - By MathHelp.com
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| 00:0-1 | In each of the following figures were asked to determine | |
| 00:03 | whether the dashed line is a line of symmetry . | |
| 00:07 | A line of symmetry divides a figure into two parts | |
| 00:11 | , such that each part is the mirror image of | |
| 00:14 | the other . In other words , if we flip | |
| 00:17 | one side of the figure over the line of symmetry | |
| 00:20 | , it should match up exactly with the other side | |
| 00:24 | . So in part a notice that if we flip | |
| 00:27 | the top side of the figure over the line of | |
| 00:29 | symmetry , it matches up exactly with the other side | |
| 00:34 | . Therefore our answer is yes , the dash line | |
| 00:38 | is a line of symmetry in part B notice that | |
| 00:43 | if we flip the right side of the figure over | |
| 00:45 | the line of symmetry , it does not match up | |
| 00:48 | exactly because the second B would then be backwards . | |
| 00:52 | Therefore , our answer is no , the dash line | |
| 00:56 | is not a line of symmetry . |
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