Calculating the circumference of a circle with a straight line of course involves pi.

Pi appeared very early in China.

This ratio has been mentioned in the Han Dynasty's "Zhou Ji Sutra" and another book, but it is only roughly calculated as 3, which is very inaccurate.

In the first decade of the first century AD, during the reign of Wang Mang, Liu Xin directly used the value of 3.154 when he made the standard measuring instrument for the master, but he used it as a result, and did not elaborate on the process by which he obtained it.

In the 3rd century AD, Liu Hui progressed pi to 3.14159, and in the 5th century AD, Zu Chongzhi and his son gave a "surplus" of 3.1415927 and a "pixel" of 3.1415926, and it was not until the 16th century AD that the Adriatic Antonins of Europe got a value close to this.

The calculation of the circumference is mentioned in the plan given to Xu Wen by Yan Jiangguan, and when it comes to pi, it is simply 3.14.

Xu Wen didn't know anything about the development of ancient mathematics, and he was surprised when he saw this.

Later, he went to Yan Jiangguan alone to inquire, and only then did he learn about the past history, which corroborated with some of the contents in the textbook in his memory, except for the different names of the people, the events were all right.

What a plausible world...... At that time, Xu Wen muttered in his heart.

However, when asked about Yan Jiangguan, he knew all about these things, which also made Xu Wen a little surprised.

This level of familiarity looks like it has been studied before.

This kind of talent was actually put here......

However, he didn't ask too much, and directly sorted out and reorganized this part of the content, and taught it to others in his own way.

He didn't expect the content to be used so quickly.

Tian Jifeng was very talented in mathematics, and he gave the result almost instantly, and wrote it on the board with great certainty.

Then, Chen Wannian measured the length of the first shunshu and reported it for Tian Jifeng to write it down directly.

This Shun Yu was close to the wall, and after measuring it, Chen Wannian moved his position on the scaffolding and came to the place of the second one.

This is a square trowel.

Plastering is also called trowel, which is the square beam and column itself, and a triangular strip is sawed off at the position of the square corner, forming a special shape.

The square plastering beam is a little more troublesome, not only to measure its height and thickness, but also to measure the angle and size of the trowel.

This is relatively difficult in this world, because in ancient mathematics, the concept of diagonal is very vague and not fully formed.

This is also reflected in the plan of the West Desert team, and the concept of this aspect is basically missing, but it is actually very important in practice.

Xu Wen chatted with Yan Jiangguan, added the content of this part, and discussed the production of a simple protractor.

Yan Jiangguan was very shocked when he heard this, but after hearing this, he just glanced at Xu Wen deeply and didn't ask anything more.

This reaction was quite strange to be honest, Xu Wen's heart moved at that time, and he thought, did he know his master and think that these things were all taught by Lian Tianqing?

This is very much in line with some of Yan Jiangguan's previous reactions, and Xu Wen estimated that he guessed correctly.

Well, that's good, some things that are inconvenient to talk about, people will automatically make up for his master.

With Lian Tianqing's personality, even if he knew, he would probably not explain it......

Therefore, now Chen Wannian has measured very skillfully, reporting all kinds of data like flowing water, and asked Tian Jifeng below to record it.

The man from the Jingying Mansion next to him had just gone back to do his own thing, and he was attracted attention again.

What are some of these things? How come they've never heard of them?

"What a mess...... Leave it alone and go your own way. Jingying Mansion looked at it for a while, shook his head, and said.

Dilin was also here, and he also saw and heard Xu Wen's movements.

He frowned and remained silent for a long time, remembering these "inexplicable" things in his head.

Chen Wannian is indeed very sharp, and he has a firm grasp of what Xu Wen taught before. He crawled around on the scaffolding, constantly reporting all kinds of data, very smoothly. I am afraid that it took more time than the process of unfastening the rope and retying it back when he changed places.

"Cowardly ......" Jingying Mansion said that he would not look at it, but he still paid attention to it occasionally, and someone muttered so.

"It's still not safe enough, and there is still a gap when the buckle is re-tied. On the other side, Xu Wen shook his head and said it out loud. He cupped his cheeks, as if he was still thinking of a safer way.

Several people in Jingying Mansion glanced at each other, and their hearts suddenly became a little hairy.

This guy attaches so much importance to this thing, is it really very dangerous to climb up and down like this?

Xu asked them to do the second task very quickly, and after completing it, they went out to hand it in and got a full sixteen points.

In fact, the original measurement requirements of the task did not include angles, but Xu asked them to indicate otherwise. Qin Lianying looked puzzled when he got this list, but Yan Ji next to him knew what was going on, and leaned over to explain it to him.

"That's less score. After listening, Qin Lianying thought for a moment and said to Yan Ji.

This is talking about Xu Wen's work, and it is also a reward for him.

They didn't have this item in the original content they set, and it was added by Xu Wen. With Qin Lianying's experience and vision, of course, he immediately saw the importance of this new concept.

"I guess the one who taught him. Yan Ji said.

But it was taken out by Yan XIV. Qin Lianying said.

He thought for a moment, then took the charcoal pen from the hand of another craftsman, and added a few more words to the west group, that is, Xu Wen's group.

"P.S. Add twenty. ”

In the west group, they scored six points for the first task and sixteen points for the second task, adding up to a total of twenty-two points. As a result, with the addition of these twenty points, the total score reached forty-two points!

At this time, the monkey group just came back to hand in the third task, which was relatively simple, only eight points. Adding the previous twenty-one points, the current total score is twenty-nine, and it is still behind Xu Wen.

The monkey was dumbfounded, and pointed directly at Xu and asked their scores and shouted: "This is not fair! Why! Where did this ten come from!"

"Hey, hey, hey, this is Master Qin!" Several people next to him turned white, and they grabbed him to remind.

The monkey was stunned for a second and shut up instantly, but the faint disbelief on his face could still be seen.

"That's extra contribution points. He provided something that we had never heard of in the Gyeongyeong Prefecture, but was very useful, and made a contribution, so he got this score. If you can provide it, you can also add points. Qin Lianying put the pen aside and said lightly.

"What, what contribution?" the monkey asked, still a little cowardly, but insisted.

"Measurement and use of angles. Qin Lianying was rarely in a good mood, and when the monkey asked, he answered.

This concept is not the same system as what the monkeys they learned, he looked confused, and a person next to him said: "Although I didn't understand, it seems to be very powerful......

"Now we're going to get serious. The monkey came back to his senses and said seriously.

At this time, Dillin's group returned from their mission.

Their group gathered the strongest people in Jingying Prefecture, so they were also the strongest group.

Di Lin stepped forward and handed a thick stack of paper to Qin Lianying's hand.

Qin Lianying didn't look at it immediately, but casually handed it to Yan Ji next to him, leaving only the task description on the most superficial surface.

"Oh, draw a cross-section of the Pure Yang Palace, big task, this is done?" he raised his eyebrows in surprise.

The monkey had not yet left, and when he heard this, he turned his head in shock.

"Very well done. Yan Ji looked through it and nodded with satisfaction.

"Yes, fifty out of all. Qin Lianying also checked it and registered the score with satisfaction, and Yan Ji had no objection as the representative of the Western Desert team.

"Cow!" the monkey immediately smiled and gave a thumbs up to Dilling.

"Please take the next task. Di Lin was not arrogant or impatient, and saluted to Master Qin.

Qin Lianying gestured to the box next to him, and Di Lin asked Jiang Dongchen to smoke it, and soon, a new note arrived in their hands.

"Draw the full plan of the front of the prayer water hall, fifty points. Dillin read it quickly, and saluted again.

"We went. ”