I. Title: Round the world, explore the infinite.

Second, the theme: understand the circle, understand the essence and life application of the circle.

Third, the content:

Basic properties of circle

A circle is a set of all points on a plane whose distance from a fixed point (center) is equal to a fixed length (radius). The basic properties of a circle include radius, diameter, center and pi. Knowing these basic properties, we can better understand and know the circle.

Circumference and area of a circle

The circumference and area of a circle are important attributes of a circle. The perimeter formula is C=2πr, where r is the radius of the circle; The area formula is S=πr? , where π is pi and r is the radius of a circle. These formulas are widely used to solve practical problems.

The Application of Circle in Life

In our life, circles are everywhere. For example, vehicle tires are round, because the round can reduce friction and rolling resistance and improve driving efficiency. In addition, the round dining table can facilitate people to communicate and share food with each other while eating. There are also some works of art, such as circular sculptures and paintings, which show the beauty and charm of the circle.

The connection between circle and other figures

This circle is closely related to other figures. For example, a circle can be regarded as a special ellipse; In a cylinder, when the height h→∞, the cylinder becomes a circle. These connections can help us better understand the nature and characteristics of graphics.

Fourth, summary:

Through handwritten newspapers, we can have a deeper understanding of the circular world. Circle is a common figure in our life, with unique properties and characteristics. By studying the nature and characteristics of the circle, we can better understand its application in life and its connection with other graphics. At the same time, we can also stimulate the love and exploration spirit of mathematics by appreciating the beauty and charm of the circle.