Examples in life are hollow steel pipes, doughnuts, rings and swimming rings. The one with a part of the ring cut off is called a fan ring. The symmetry of the ring is very strong, it is a central symmetrical figure with the center of the circle as the symmetry center, and it is also an axisymmetric figure with countless symmetry axes. The geometric center of a ring is the center of a circle.
Application of circular ring
1, Olympic rings
The five rings represent five continents, the Olympic rings are a whole, Asia is yellow, Africa is black, Europe is blue, America is red and Oceania is green. The five rings represent the five continents of the world, and the five colors represent people of different colors on five continents. The five rings together represent that people from five continents can get along well.
2. The birth of the ring flag
1965438+In June 2004, the International Olympic Committee held its16th plenary session in Paris. The closing day of the plenary session, June 23rd, coincides with the 20th anniversary of Coubertin's first Olympic Games in Paris-Sorbonne.
On the occasion of celebrating the 20th anniversary of the birth of the Olympic Movement, Baron Coubertin, President of the International Olympic Committee, presented his masterpiece-the flag of the International Olympic Committee, which consists of a white background and five rings of blue, yellow, black, green and red.