What can a circle become?

Many figures can be drawn with circles, such as the sun, coins, plates, biscuits, football, bear heads, wheels, hula hoops, rings, balloons and so on.

Here are some simple graphic drawing methods:

1, you can draw a sun, draw a circle first, and then add a flame outside the circle, and a sun is formed.

2, you can draw a smiling face, first draw a circle, then draw two round eyes and a curved mouth, and a smiling face will be drawn.

3, you can draw a football, first draw a circle, plus black and white football lines, a football is drawn.

4, you can draw a balloon, first draw a circle, and then add a line below, you can draw more, the following lines are connected together, it is a pile of balloons.

5. You can draw a wheel, first draw a circle, then draw a slightly smaller concentric circle inside, draw a small circle at the center of the circle, and draw several straight lines in the middle.

The ancients first got the concept of circle from the sun and the moon on the fifteenth day of the lunar calendar. On the Neanderthal 18000 years ago, he used to drill holes in animal teeth, gravel and stone beads, some of which were very round. In the pottery age, many pottery were round. Round pottery is made by putting clay on a turntable.

When people start spinning, they make round stone spindles or ceramic spindles. The ancients also found it easier to roll when carrying logs. Later, when they were carrying heavy objects, they put some logs under big trees and stones and rolled away.

About 6000 years ago, Mesopotamia made the world's first wheel-a round board. About 4000 years ago, people fixed round boards under wooden frames, which was the original car. The ancient Egyptians believed that the circle was a sacred figure given by God.

It was not until more than two thousand years ago that China's Mozi (about 468 BC-376 BC) gave the definition of a circle: a circle, a circle of equal length. It means that a circle has a center, and the distance (i.e. radius) from the center to all points on the circumference is equal. This definition is 100 years earlier than that of the Greek mathematician Euclid (about 330 BC-275 BC).