School time for most adults is associated with a carefree childhood. Of course, many are reluctant to attend school, but only there they can get basic knowledge that will later be useful to them in life. One of these is the question of what a circle and a circle are. It is quite easy to confuse these concepts, because the words are of the same root. But the difference between them is not as big as it might seem to an inexperienced child. Children love this theme because of its simplicity.
What is a circle?
Circle is a closed line, each point of which is equally removed from the central one. The most striking example of a circle is a hoop, which is a closed body. Actually, there is no need to talk too much about the circle. In the question of what a circle and a circle are, its second part is much more interesting.
What is a circle?
Imagine that you decide to decoratecircle drawn above. To do this, you can choose any colors: blue, yellow or green - whichever is closer to your liking. And so you began to fill the void with something. After this was completed, we got a figure called a circle. In essence, a circle is a part of the surface outlined by a circle.
A circle has several important parameters, some of which are also characteristic of a circle. The first is the radius. It is the distance between the center point of the circle (well, or circle) and the circle itself, which creates the boundaries of the circle. The second important characteristic that is repeatedly used in school problems is the diameter (that is, the distance between opposite points of the circle).
And finally, the third characteristic inherent in the circle is the area. This property is specific only to it, the circle has no area due to the fact that it has nothing inside, and the center, unlike the circle, is more imaginary than real. In the circle itself, you can set a clear center through which to draw a series of lines that divide it into sectors.
Examples of a circle in real life
In fact, there are enough possible objects that can be called a kind of circle. For example, if you look at the wheel of the car directly, then here is an example of a finished circle. Yes, it does not have to be filled in one color, various patterns inside it are quite possible. The second example of a circle is the sun. Of course, it will be hard to look at it, but it looks like a small circle in the sky.
Yes, the Sun itself is not a circle, it hasalso the volume. But the sun itself, which we see above our head in the summer, is a typical circle. True, he still cannot calculate the area. After all, its comparison with a circle is given only for clarity, to make it easier to understand what a circle and a circle are.
Differences between a circle and a circle
So what conclusion can we draw? What distinguishes a circle from a circle is that the latter has an area, and in most cases the circle is the boundary of the circle. Although there are exceptions at first glance. It may seem sometimes that there is no circumference in a circle, but it is not. In any case, there is something. It's just that the circle can be very small, and then it is not visible to the naked eye.
Also, a circle can be something that makes the circle stand out from the background. For example, in the image above, the blue circle is on a white background. And here is the line by which we understand that the figure begins here, and is called in this case a circle. So a circle is the boundary of a circle. This is the difference between a circle and a circle.
What is a sector?
A sector is a section of a circle, which is formed by two radii drawn along it. To understand this definition, you just need to remember pizza. When it is cut into equal pieces, they are all sectors of the circle, which is presented in the form of such a delicious dish. In this case, the sectors do not have to be equal at all. They can be of different sizes. For example, if you cuthalf of the pizza, then it will also be a sector of this circle.
The object displayed by this concept can only have a circle. A circle (a radius can also be drawn, of course, but after that it will become a circle) has no area, so the sector cannot be selected either.
Conclusions
Yes, the topic of the circle and the circle (what is it) is very easy to understand. But in general, everything related to these geometric shapes is the most difficult to study. The student needs to be prepared for the fact that the circle is a capricious figure. But, as they say, hard in learning - easy in battle. Yes, geometry is a complex science. But the successful development of it allows you to take a small step towards success. Because the efforts in training allow not only to replenish the luggage of one's own knowledge, but also to acquire the skills necessary in life. In fact, this is what the school is about. And the answer to the question of what a circle and a circle are is secondary, albeit important.
