King Shiloh of Syracuse asked the goldsmith to make a crown out of pure gold. Because it is suspected that there is silver mixed in it, Archimedes is invited to identify it. When he entered the bathtub to take a bath, the water overflowed outside the bathtub, so he realized that although the weight of objects made of different materials was the same, the discharged water would be different because of their different volumes. According to this truth, it can be judged whether the crown is adulterated.
Ancient Greece was the hometown of mathematics. The ancient Greeks made great contributions to the progress of mathematics. This ancient civilization gave birth to many mathematicians, such as Thales, Pythagoras, Euclid, apollonius, Archimedes, Ptolemy, Helen and Diophantine. Hipatia, the first female mathematician in history, was also born here.
Hipatia (about 370-4 15). Born in Egypt. He was a famous mathematician in ancient Greece. Known as the first female mathematician in the world. This clever woman ranks among the best scholars in the ancient world with her talent and contribution. And her tragic death is really an eternal tragedy. What savage and cruel religious fanatics have done to her.
Zu Chongzhi (AD 429-500) was born in Laiyuan County, Hebei Province during the Northern and Southern Dynasties. He read many books on astronomy and mathematics since childhood, studied hard and practiced hard, and finally made him an outstanding mathematician and astronomer in ancient China.
Zu Chongzhi's outstanding achievement in mathematics is about the calculation of pi. Before the Qin and Han Dynasties, people used "the diameter of three weeks a week" as pi, which was called "Gubi". Later, it was found that the error of Gubi was too large, and the pi should be "the diameter of a circle is greater than the diameter of three weeks". However, there are different opinions on how much is left. Until the Three Kingdoms period, Liu Hui put forward a scientific method to calculate pi-"secant" which approximated the circumference of a circle with the circumference inscribed by a regular polygon. Liu Hui calculated that the circle inscribed by a 96-sided polygon is π=3. 14, and pointed out that the more sides inscribed by a regular polygon, the more accurate the π value is. On the basis of predecessors' achievements, Zu Chongzhi worked hard and repeatedly calculated that π was between 3. 14 15926 and.
Su 1902 was born in Zhejiang in September. In the third grade, a math teacher came. He said: "In today's world, all the world powers want to carve up China. The danger of China's national subjugation is imminent. In order to save the nation and survive, we must revitalize science. Mathematics is the pioneer of science. In order to develop science, we must learn math well. " 17 years old, Sue went to study abroad. When Sue went to a Japanese university as an associate professor, he decided to return to China. In the face of difficulties, his answer is: "What is hardship? I am willing, because I have chosen the right road, which is a bright patriotic road! "