Main content: I happened to find that triangles are everywhere in our lives during a trip, which made me wonder why so many figures chose triangles. Then I looked up the books on the Internet and found that the mystery of triangle is stability. Then I did a series of experiments to prove its stability. Then I went into society and life, and discussed the stability of triangle carefully. If necessary, I will also consult relevant people to facilitate my investigation. In this investigation again and again, I have benefited a lot!

In all the data I investigated, it has been proved that the triangle is the strongest of all the figures.

Keywords: triangle; Stability; Discover; Experiment; Mathematics kingdom; Graphics; App application

Text: It's sunny today. Dad said he would take me to play. I'm so happy. I skipped to play with my father. I like everything around me. I look around. At this time, I found a wonderful phenomenon. I see that the buildings, steel wire frames and everything that needs to be strong here use triangles. At that time, I wondered, there are not only triangles in the mathematical kingdom, but also so many figures. Why use triangles? I can't figure it out. So I asked my father, and my father told me that if I had a problem, I would solve it myself, believing that I would succeed. After listening to my father's words, I checked the computer data online immediately after I got home. Sure enough, I found my answer. It turns out that triangles have certain stability and can accommodate an object, while other figures in the mathematical kingdom are not as stable as triangles. When I understood these truths, I still didn't understand them, so I found all the information and decided to do some experiments to prove it myself.

First, I found a bunch of sticks to do this experiment, and then I made an experiment plan and steps. After everything was ready, I began to do the experiment. Do the first experiment first: I take out three sticks, make them into triangles, and then pull them hard with both hands. Turns out I can't get rid of him at all. I was worried that my strength was too small, so I asked my father to help me pull it, but he still didn't move. Then, I took out four sticks and made them into quadrangles. I pulled them with both hands and found that I changed his shape without much effort. At this time, I came to the conclusion that the stability of other graphics is not firm except triangles. At this moment, an idea suddenly appeared in my mind: can I make use of the characteristics of triangles to make this quadrilateral firm? I had a brainwave, pulled out a stick and added it to the opposite corner of the quadrilateral. The quadrilateral immediately became two triangles, and as I expected, it became stronger. Neither my father nor I can change him. I jokingly said to my father, "Dad, it's time for you to exercise. You are so old that you can't even pull a few sticks. Dad, ha ha ha smile.

Then, I did the second experiment. I made a quadrangle with a stick, and every page made a quadrangle with a stick. I took out another pile of books. With the help of my father, I tested the carrying capacity of the next two devices respectively. At this time, I was surprised to find the gap. One of the ordinary quadrangles was almost fragile and collapsed without putting many books. I think this contrast is too big. Sure enough, when I was testing a quadrilateral with two triangles each with a stick, there was an amazing scene. The bearing capacity of this device was too strong. I was dumbfounded. I firmly believe that the stability of this triangle is 10,000 times better than other figures in the mathematical kingdom.

Last time, I only found the application of trigonometric stability in a hurry and by accident, but today, it is different. I want to devote myself to the society and explore how to apply this mystery in my life. So, I got up early just to find out. On the street, I found that several beams of the bicycle formed a triangular support; Some farmhouses also have triangular roofs; There are countless supports such as high-voltage telephone poles. This makes me see things in a blur. I also learned from many books that in daily life, the use of triangles is not limited to these. In 200 1 year, Russia newly invented a triangular multi-purpose plane, which is a small plane for two people. The plane is called "Kruiz" and is made of ultra-light composite materials. The aircraft fuselage is triangular, and the wing can flexibly change the flight angle under the control of the pilot. "Cruz" is equipped with aerobatic flight, pilot and engine parameter control system, which can complete difficult flight actions with simple operation process. It can not only monitor forest farms, power transmission lines and oil pipelines in the air many times, but also carry tourists to experience thrilling aerobatics. His outstanding performance is inseparable from the characteristics of triangle attack. So triangles are everywhere in our lives. I think as long as we observe carefully, we can find more secrets in the triangle.

Conclusion: In this experiment and investigation, I learned a lot, understood a lot and knew more. Triangle is an indispensable figure in the mathematical kingdom, and of course, because of its stability, it has become the most important figure. So we can't live without triangles, and we can't live without the mystery and stability of triangles. But since the kingdom of mathematics is so big, I naturally have many questions: Why are there polygons? Why can a square be called a rectangle and a rectangle cannot be called a square? ……

Grade one: 33 1793544