happy life through time

The boat slowly approached the river bank, and after an unknown amount of time, it had already reached the river bank.

The boat stopped, Master Li didn't answer Tong Yan's words, Tong Yan couldn't figure it out, seeing a lot of discussion around, some people who didn't understand the matter were laughing at him, could it be that he was the only one who didn't know where the wooden pole was?

Tong Yan stood still, then Li Dashi stood up and walked to Tong Yan, Tong Yan still respectfully cupped his hands.

Li Dashi took a deep look at Tong Yan, with a hint of expectation in his eyes, and pointed to the side of the river bank, where a wooden pole was inserted into a flat ground, towering into the sky.

"That's the wooden pole you want to measure. The premise is that the wooden pole is not allowed to be pulled out. It can only be stood upright and measured with such a three-inch long ruler. Do you have a way to measure it?"

Hearing Li Dashi's words, the students on and off the stage looked at each other in blank dismay, wondering how... such a tall wooden pole should be measured.

"Here, how do you measure such a short ruler and such a tall wooden pole? Do you need to use light work?"

"Hey, who is so good at qinggong? Can fly so high?"

"It can't be put down, how do we measure it? Is it possible to build a ladder, and when can we measure it?"

"There is no solution to this question, anyway, I give up."

"Could it be to embarrass us on purpose, but it's impossible. The examiner can't give questions without answers."

……

Everyone said something to each other, and those who laughed at Tong Yan at first lowered their heads, not to mention that they also didn't know where the wooden pole was, and they didn't know how to measure it.

Tong Yan looked at the tall wooden pole, because it was night and he couldn't see the top, so he thought it should be very high, just like on the moon.

But in fact, that is just an illusion of sight. If such a question is placed in modern times, it is definitely a very simple question. You only need to measure the length of the shadow of the wooden pole, and then take a short wooden pole from the outside. Measure its length and the length of its shadow, and use the theorem that the corresponding sides of similar triangles are proportional to find the length of the wooden pole.

However, Tong Yan didn't know what to say, there is no so-called geometric solution in this world.

Li Dashi glanced at Tong Yan, the corners of his mouth slightly curled up, and thoughtfully said: "Follow me!"

Tong Yan glanced at Li Subaran without knowing why, and finally followed him to leave.

Everyone looked at Tong Yan and Li Maoran who were leaving inexplicably, only to realize that the relationship between Tong Yan and Master Li was unusual, or that Tong Yan actually boarded the boat of Master Li.

Li Subaran took Tong Yan into the private room at the beginning, and Tong Yan told Mr. Li his method of solving the problem.

Although he found it unbelievable, Li Subaruan still looked at Tong Yan in surprise: "Is the method you mentioned effective?"

"If you don't believe me, you can ask someone to try it. This way, the best answer can only be solved when the sunlight or light remains unchanged, that is to say, the length of the shadow must be measured at the same time to get the best answer." Good answer."

After saying that, Li Subaruan asked two people to come in, and according to Tong Yan's request, he found two wooden sticks, one long and one short.

The painting boat was full of lights, and the sticks were erected. Tong Yan measured the length of the short stick and the length of the shadow on the ground, and then measured the length of the shadow of the long stick, and then used the method of proportionality of the corresponding sides to find the length of the long stick. length.

Li Subaruan has been watching from the side, always feeling very novel and curious. When Tong Yan used the shadow method to find the length of the long wooden stick, and then used a ruler to measure the length of the long wooden stick, the result turned out to be exactly the same.

The length units here are mainly inches, feet, feet, and miles, and the error is not very large, so the obtained answer is infinitely close to the correct answer.

Li Subaran was overjoyed, and experimented several times in a row, and the answers he got were all extremely close.

"Okay, very good, hahaha..." Li Subaruan laughed loudly, his voice was full of fighting spirit, he patted Tong Yan on the shoulder and said: "Study hard, try to get a Juren. If it is proved that this method is That's right, you will become a hero of the Yan Kingdom! Those so-called masters will lose their eyes, hahaha..." Li Subaruan laughed and went out after saying this.

Tong Yan just felt baffled, but since Li Subaruan had left, of course he had to leave too.