Last semester of Senior Two, we learned a practical and easy-to-understand theorem-Pythagorean Theorem. Pythagorean theorem is the property that the sum of the squares of two right angles of a right triangle is equal to the square of the hypotenuse, also known as Pythagorean theorem or Pythagorean theorem.
What impressed me most in my mind is Pythagorean tree, which is a tree-like geometric figure connected continuously by Pythagorean theorem. The sum of the areas of two adjacent small squares is equal to the area of one adjacent large square. It looks very chic and beautiful, because Pythagorean theorem is a pearl in the history of mathematics, which will make it more convenient for people to recalculate some problems.
If you turn Pythagorean theorem upside down, it is still the inverse theorem of Pythagorean theorem, and its greatest advantage is that it can prove that some triangles are right triangles. This is very valuable in our geometric problems.
The Pythagorean theorem is recorded in China's ancient book Zhou Parallel Calculation: "If you seek evil from the sun, take the sun as a sentence and the sun as a copy, and multiply each sentence separately to get evil from the sun." Moreover, it also records the proof of Pythagorean theorem: the former Duke of Zhou asked Shang Gao: "I have heard for a long time that doctors are good at counting, so I want to invite the former to sacrifice."
Shang Gao said: "The counting method comes from the square, the circle from the square, the square from the moment, and the moment from 998 1. So I folded it instantly, thinking that the sentence is three in width, four in thigh and five in diameter. If the square is square, the outer half is moment, and the ring is * * *, that is 345. The two moments * * * are twenty and five respectively, which are called product moments. Therefore, the reason why Yu ruled the world was born of this number. "
Pythagoras in ancient Greece also discovered Pythagoras theorem. But according to many clay tablets, the Babylonians were the first people in the world to discover the Pythagorean theorem. This shows how smart, careful and good at discovering people ancient people are!
France and Belgium call Pythagorean Theorem Donkey Bridge Theorem, and Egypt calls it Egyptian Triangle. In ancient China, the shorter right-angled side of a right-angled triangle was called a hook, the longer right-angled side was called a chord, and the hypotenuse was called a chord, so it was also called the Pythagorean chord theorem.
Pythagorean theorem has a long history, and we can't be defeated by the ancients. We must be good at discovery, use it flexibly in life and carry it forward!