Std. 4th
Subject - Math's
Geometrical figuresCIRCLE
See the video below. खालील व्हिडीओ बघा. समजून घ्या.
Exercise
Drawing Figures -
1. CIRCLE -
Take a small Steel bowl. Play seat upside down on a piece of paper and trace its outline. Remove the bowel. The figure you get on the piece of paper is a circle.
2. Chord-
Draw two or three circles like this one and cutout the circular paper shapes.
Take one of these shapes and fold it has shown in the picture. Trace the line of the fold with the pencil. This line is called a chord of the circle.
3. Diameter (व्यास)-
Now fold another circular se to divide it into two halves. Trace the line of the fold with the pencil. This line is called a diameter of the circle. The diameter, too, is a chord of the circle.
4. Centre (केंद्रबिंदू)-
Now for the same again so that we get a quarter part of the shape.
Unfold the paper shape. Now, you see the circular shape again. Trace the line of the folds.
The point at which these lines meet each other is the centre of the circle.
Name the centre of the circle, M. Take any point P. On the circle. Draw the line MP with your ruler. MP is a radius of the circle.
Take a piece of paper. Choose any point near the middle of the paper. Take a suitable distance between the Steel tip of the compass and the tip of the pencil. Place the Steel tip on the chosen point. Hold it in place and turn the pencil tip around it to trace a circle.
Mark with red pencil. The point at which you held the still now cut out this circle. Folded twice as before to obtain two diameters of the circle. Observed that these two diameters meet at the red point. It means that the red point is the centre of the circle.
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