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Update index.md (#31410)

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2019-01-20 08:57:41 +05:30
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guide/english/mathematics/area-of-a-circle/index.md
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@ -84,6 +84,14 @@ Note: Max could have estimated the area by:
2. Taking 80% of that (estimates a circle): 80% × 0.16 m2 = 0.128 m2
3. And the volume of a 1 m deep hole is: 0.128 m3
#### Something more about circle
* ARC- An arc is part of the circumference of a circle.
* CHORD- Chord is a straight line joining two points on a circle, the diameter is an example of a chord (and the longest possible chord of circle).
* SEGMENT- A segment is the region between a chord and the arc it joins.
* SECTOR- A sector is the region between an arc and two radii.
![alt](http://www.kidsmathgamesonline.com/images/facts/circlesector220.jpg)
#### More Information
More information with illustrations can be found [WikiHow](https://www.wikihow.com/Calculate-the-Area-of-a-Circle)