What is Circle ?

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The fraction of a circle is a degree. In each of an imaginary circle, you can find 360 degree. Each degree can define the surface of the earth.

The one sided shape with an area is only owned by a circle.

An infinite area is owned by a circle. It also has a straight line. You can also see some lines of symmetry.

If you look at rectangle or square, it has some angles. If you look at a circle, you will find no angles. You can find some real examples of a circle in the shape of a dimmer plate, coin and a wheel.

Each circle has a diameter. It is defined with the distance across a circle through the center of the circle.

If you want to know the radius of a circle, you just have to know the diameter. A diameter is twice as long as a radius. If you have a diameter in 8 inches, the radius is 4 inches.

There are three parts of plane that a circle divides. The planes can be divided on the point on the circle, the points inside the circle and the points outside the circle.

The behavior of an animal is also defined based on the rotating circle. You can see a group of army ants. They will die because of exhaustion when they set separated in pheromone track. The ants will keep moving in circle rotation.

Human being is not equipped with an instinctive sense of direction. It makes them walk in circle and circle due to the lack of navigational clues.

Check out our circle facts for kids and learn some interesting information about this two dimensional polygon. Find out what the radius, diameter and circumference are, how to measure the area of a circle, what a circle chord, sector and segment are and much more.

A circle is a round, two dimensional shape that looks similar to the letter ‘O’.

In strict mathematical language, circle refers to the boundary of the shape while ‘disk’ is used to refer to the whole shape, including the inside.

A straight line from the center of a circle to the edge is called the radius.

A straight line that passes from one side of a circle to the other through the center is called the diameter.

The distance around the outside of a circle is called the circumference.

All points on the edge of a circle are the same distance to the center.

The value of Pi (π ) to 2 decimal places is 3.14, it comes in handy when working out the circumference and area of a circle.

The circumference of a circle can be found with the following formula: Circumference = π d

The area of a circle can be found with the following formula: Area = π r²

An arc is part of the circumference of a circle.

A chord is a straight line joining two points on a circle, the diameter is an example of a chord (the longest possible one).

In geometry, a circle is the locus of points at the same distance from a given fixed point.
The word locus sounds complicated, but it means set of all points on a plane.

A segment is the region between a chord and the arc it joins.

Another way then to define a circle is to say that it is the set of all points that are at the same distance from a fixed point.