Euclid is the most famous and recognized mathematics competition in Canada, with high gold content.

Liu Hui (about 225-295) was born in Zouping, Binzhou City, Shandong Province. Mathematician in Wei and Jin Dynasties, one of the founders of China's classical mathematics, wrote Nine Arithmetic Notes and Arithmetic on the Island.

Notes on Nine Chapters Arithmetic is the annotation of Nine Chapters Arithmetic, which was put forward by him. The concept of positive and negative numbers and the arithmetic of addition and subtraction, he calculated pi = 3. 14 16 by using the secant circle method, and made many creative contributions in algebra and geometry, which was called "Euclid of China" and "Newton in the history of Chinese mathematics".

The book Island Calculation is called Island Calculation because the first topic is to measure the height of an island.

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Euclid and Dream David are both important theorems in geometry. The difference between them is that:

1. Theorem Content: Euclid Theorem, also known as Pythagorean Theorem, means that the sum of squares of two right angles of a right triangle is equal to the square of the hypotenuse; Dream David theorem involves the area of a triangle, which stipulates that the area of a triangle is equal to half of the product of the base and the height.

2. Research field: Euclid theorem belongs to the basic content of plane geometry, and it is a knowledge point that most people must master when learning mathematics, while Dream David theorem is the content of solid geometry, and it is rarely used.

3. Historical background: The name of Euclid theorem originated from the Greek mathematician Euclid around 300 BC, and the Dream David Theorem was discovered and named by the French mathematician Dream David in the17th century.

In a word, Euclid Theorem and Dream David Theorem are both important theorems in geometry, but they are different in research field, theorem content and historical background.