Area of a Circle | MathHelp.com - By MathHelp.com
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| 00:0-1 | In this example we're asked to find the area of | |
| 00:03 | the circle shown . The formula for the area of | |
| 00:06 | a circle is area equals pi times radius squared . | |
| 00:15 | Since the radius of the circle shown is nine cm | |
| 00:18 | , we can plug nine cm in for the radius | |
| 00:21 | in our formula and we have pie times nine centimeters | |
| 00:28 | squared . Remember that nine cm squared is the same | |
| 00:32 | thing as nine cm times nine cm ? Yeah , | |
| 00:39 | So we have pi times nine cm times nine cm | |
| 00:44 | , which simplifies to 81 pie centimetres squared . So | |
| 00:51 | one way to write the area of the circle shown | |
| 00:54 | is 81 pi square cm . Next , remember that | |
| 01:01 | pi is approximately equal to 22 7 or 3.14 So | |
| 01:06 | we can plug 3.14 and for pie And we have | |
| 01:10 | 81 times 3.14 centimetres squared , Which equals 254 .34 | |
| 01:23 | cm two . So another way to write the area | |
| 01:27 | of the circle shown is 254.34 square cm . |
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