Circumference of a Circle | MathHelp.com - By MathHelp.com
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| 00:0-1 | to find the circumference of the circle shown , we | |
| 00:03 | use the formula circumference equals two times pi times the | |
| 00:08 | radius or c equals two pi r . In this | |
| 00:17 | problem , however , notice that were given the diameter | |
| 00:20 | instead of the radius To find the radius , remember | |
| 00:24 | that the radius of a circle is equal to half | |
| 00:26 | of the diameter , so the radius of the circle | |
| 00:29 | shown is equal to half of 14 cm or seven | |
| 00:35 | centimetres . Now to find the circumference we plug seven | |
| 00:41 | cm , and for the radius in our formula , | |
| 00:44 | and we have two times pi times seven centimetres , | |
| 00:51 | Which simplifies to 14 pie cm . So one way | |
| 00:58 | to write the circumference of the circle shown is 14 | |
| 01:02 | pie cm . Next remember that Pi is approximately equal | |
| 01:10 | to 22/7 or 3.14 . So we can plug 3.14 | |
| 01:16 | in for pie . And we have 14 Times 3.14 | |
| 01:23 | centimetres , which simplifies 2 43 .96 cm . So | |
| 01:34 | another way to write the circumference of the circle shown | |
| 01:36 | is 43.96 cm |
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