Circle

A circle is a simple closed curve but not a polygon. A polygon has line-segments, but a circle has only a curve.

Circle

We can draw circles around the edge of a circular coin, around the bottom of a cylindrical bottle, a bottle cap or any circular thing.

A circle has no side and no vertex, but a fixed point inside it. Each and every point of the curve is always equidistant from this point. 

The closed figure is the circle. The enclosing curve whose every point is at equidistance from a fixed point is called the circumference. The fixed point inside the circle is the centre and the distance from the center to circumference is the radius.

We use an instrument for drawing a circle on paper. This instrument is called the compass.

A compass consists of two legs. One of its legs is long and the other is short. The long leg has a needle-like pointed end. The short leg has a holder-like small pipe in which a pencil can be placed.

How to draw a circle with the help of the compass?

To draw a circle with the help of the compass, its two legs are pulled apart and the distance between the pencil tip and needle end is made equal to the radius of the circle (say 2 cm).

Now the needle end is fixed on the paper and the leg containing the pencil is rotated without disturbing the tip or needle end of the long leg. The pencil tip makes the circle.

Math Only Math is based on the premise that children do not make a distinction between play and work and learn best when learning becomes play and play becomes learning.


However, suggestions for further improvement, from all quarters would be greatly appreciated.

4th Grade Math Activities

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