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PUMPA - SMART LEARNING
எங்கள் ஆசிரியர்களுடன் 1-ஆன்-1 ஆலோசனை நேரத்தைப் பெறுங்கள். டாப்பர் ஆவதற்கு நாங்கள் பயிற்சி அளிப்போம்
Book Free DemoFamiliarize yourself with the mathematics tool - the Compass.
Compass can look different, but all whips have two legs - a sharp-pointed pin and a pencil.
Compass can be used to draw a circle.
![Screenshot_1.png](https://resources.cdn.yaclass.in/00dbefbf-6c04-41d2-ba7c-73c5dc316ade/Screenshot_1-w69.png)
If you mark a small mark or dot on a piece of paper and place the sharp crank leg at that point, you can draw a circle. The dot is called the center of the circle, and we usually denote by the capital letter \(O\).
The segment joining center \(O\) of a circle to a point on the circle (point A in the drawing) is called the radius.
The figure shows that the radius of the circle \(OA\) is \(5\)\(cm\) (Figure: 1).
Compass is needed - with the feet of the cruiser measured to the desired distance to draw a circle with a given radius.
Figure: 1
![Screenshot_2.png](https://resources.cdn.yaclass.in/bb17393f-a218-4366-a2b3-f361507e0931/Screenshot_2-w200.png)
- The coloured part inside is the area of a circle. (Figure: 2).
Figure: 2
![Screenshot_3_blue.png](https://resources.cdn.yaclass.in/b0e3e3c4-7d74-4f5b-9fcd-87e257b244a7/Screenshot_3_blue-w200.png)
The segment passing through the center of the circle and joining the two points of the circumference is called the diameter.
- The diameter is \(EF\) (Figure: 3).
Figure: 3
![Screenshot_4.png](https://resources.cdn.yaclass.in/81efe682-2dd5-44e4-900c-a808ae28f7b1/Screenshot_4-w200.png)
- The segments \(AO, BO, CO, EO, FO\) are the radii of the circumference (Figure: 3).
The radii of the circle are equal in length.
\(AO = BO = CO = EO = FO\)
\(AO = BO = CO = EO = FO\)
The diameter of the circle is \(2\) times longer than the radius.
If the radius of the circle is \(5\)\(cm\), then the diameter is \(2·5 = 10\) (\(cm\)).