The 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, which later will be useful to them in life. One of these is the question of what is a circle and a circle. Confusing these concepts is quite simple, because words are cognate. But the difference between them is not as big as it may seem to an inexperienced child. Children love this topic because of its simplicity.
What is a circle?
A circle is a closed line, each point of which is equally remote from the center. The most striking example of a circle is a hoop, which is a closed body. Actually, there is no need to talk especially about the circle. In the question of what is a circle and a circle, the second part is much more interesting.
What is a circle?
Imagine that you decided to colorize the circle drawn above. To do this, you can choose any color: blue, yellow or green - to whom that is more to your liking. And so you began to fill the void with something. After it was finished, we got a figure called a circle. In fact, a circle is a part of a surface defined 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 called the distance between the center point of the circle (or circle) and the circle itself, which creates the boundaries of the circle. The second important characteristic that is repeatedly used in school tasks 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 him, the circle has no area due to the fact that it has nothing inside, and the center, in contrast to the circle, is more imaginary than real. In the same circle, you can set a clear center through which to draw a series of lines that divide it into sectors.
Real life circle examples
In fact, there are enough possible objects that can be called a kind of circle. For example, if you look directly at the wheel of a car, here is an example of a finished circle. Yes, it does not have to be filled in monotonously; 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 him, but it looks like a small circle in the sky.
Yes, the star the Sun itself is not a circle, it also has a volume. But here the sun itself, which we see above our head in the summer, is a typical circle. True, he still can’t calculate the area. After all, comparing it with a circle is provided only for clarity, so that it is easier to understand what a circle and a circle are.
Differences of a circle from a circle
So what conclusion can we draw? The difference between a circle and 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 sometimes seem that there is no circle in the circle, but this is not so. In any case, there is something. Just a circle can be very small, and then it is not visible to the naked eye.
Also, a circle can be what makes a circle stand out from the background. For example, in the image above, the blue circle is on a white background. And here is the feature by which we understand that a figure begins here, and is called in this case a circle. Thus, a circle is the boundary of a circle. That's the difference between a circle and a circle.
What is a sector?
A sector is a section of a circle that 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, all of them are sectors of the circle, which is presented in the form of such a delicious dish. At the same time, sectors need not be equal at all. They can be of different sizes. For example, if you cut off half a pizza, then it will also be a sector of this circle.
The item 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) does not have an area, so the sector cannot be allocated either.
conclusions
Yes, the topic of a circle and a circle (what it is) is very simple to understand. But in general, everything related to these geometric figures is the most difficult to study. The schoolboy 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 its successful development allows you to take a small step towards success. Because diligence in training allows not only to replenish the luggage of one’s own knowledge, but also to receive the skills necessary in life. Actually, this is what the school aims at. And the answer to the question of what a circle and a circle is is secondary, albeit important.