"When you know the lengths of two sides of a triangle, don't you ever wish you knew the length of the remaining side?"

<, Jin decided to start by explaining its usage.

He felt that Cachier would prefer a more practical theory.

"No ...... I don't have one. ......"

Since he was told that there was none, Jin decided to give an example that he knew.

For example, when you make a roof, you know the height and width or depth of the roof. What do you do when you need to find the length of a diagonal girder?"

"I don't build houses, but I understand your analogy. It would certainly be useful to be able to calculate the lengths of the diagonal sides."

"Right?　The theorem of 3-square is a theorem that holds for right triangles and says that the square of the length of the oblique side is equal to the sum of the squares of the lengths of the two remaining sides.

The equation is a^2 + b^2 = c^2.

This is a theorem that students learn in junior high school.

"...... Oh, so that's when comes in handy?"

"That's what I mean."

After that, Jin explained that the square root also has a sequence of numbers after the decimal point, and that it is difficult to calculate them one by one, so he referred to <>.

* * * * * * * * * *

"Jin-dono, Katya. Let's have lunch soon.

The carriage stopped. A voice called out from outside.

"Oh, it's lunchtime already?"

Jin and Chair got off the carriage. They were on a large grassy plain, overlooking a vast plain below. There was a large river running through it.

"That's the Nosina River, isn't it?"

"That's ......, isn't it?"

When Katya got off the carriage, she was back to her usual self.

Lunch was a loaf of bread soaked in a meat broth.

"Are you accustomed to eating ...... Jin-dono?"

Jed Alamold asked as Jin ate in silence.

"No, it's not like that.

"Hmmm... ......"

The lunch was served half on purpose. It's the kind of thing that a wealthy person would never eat.

Although the dried bread would soften if soaked in the soup, the soup is lightly seasoned and lacks umami.

Jin, however, ate his share of the soup with a seemingly unconcerned look on his face.

(I don't know more and more)

The report of Lorenz, the information from Sergei, and the image of Jin that I had seen with my own eyes were not quite the same.

(If he was a mage, he must have lived a reasonably wealthy life. ) From what I heard from my subordinates, he was well educated. In other words, he was not likely to be an upstart. And yet he acts like a commoner. I don't understand.)

I don't know.

The wagons started moving again, and we arrived at Fan Village, our next stop, at 3:00 p.m., which was relatively close.

This was partly because the road was gently descending.

"So this is Fan Village."

"......I've been here before."

Jin's impression was that it was not much different from Tazie Village. The same was true for Katya,

"I like Tazy Village better," she said.

I like Taj village better.

We stayed at the chief's house. The villager's house was a large detached house built for this kind of situation.

Jin and Katya were each assigned a private room.

The sun is still high.

We arrived at 3:00 p.m., and it had only been half an hour. Jin was about to go for a walk,

"Jin-dono, may I have a word?

Jed Alamold appeared.

"Yes, is there something wrong?

"No, nothing. No, nothing else. We have a broken pump here in Fan Village. If you don't mind, I was wondering if you could repair it for me. Yes, of course I will pay for the repair. ...... Well, how about 1,000 dollars?"

"Yes, sure."

Hitoshi readily agreed.

"Okay, then."

When he and Jed went outside, an older man was waiting for them. He was Rasnikov, the village head.

His hair was white, and if you looked closely, you could see that his waist was beginning to curve a little.

He said, "Thank you for your hospitality.

He greeted Jin and Jed and led them away.

"It's this way."

A little further into the village was a pump of the same type as the one in Tajee.

"Oh, I can fix this in no time.

However, as far as repairing the pump was concerned, Ka-cea had already nailed me for a long time, so I took my time to repair the pump.

It took him about 20 minutes to complete the repair.

"It's done!

After confirming that water comes out properly, he reports that it's done.

"Oh, oh, thank you very much!

After receiving a thousand dollars from Jed Alamordo, who thanked him profusely, Jin told the chief that he would take a walk around the village and return home.

"Then it would be better to have someone to guide you," he said.

"Then I will."

The village head came forward.

Jin frowned a little, but said nothing and gave a small nod.

"That's the communal washing area," he said.

"Do you use soap?"

"No, no, we can't afford such expensive stuff, so we use sapo nuts.

He showed me the sapo nut, which looked very similar to the rita nut used in the village of Kaina. Jin thought that they might be closely related plants.

"That's the public bathhouse, isn't it?

"Is there a hot spring?

What is a hot spring?　What is a hot spring? The water is pumped.

This is the storage room.

A snow cellar.

You know it well. The snow that falls during the winter is stored here and remains until the fall. That's where we store the perishable foodstuffs.

* * * *

Jin thinks in his room at the inn.

The level of culture is about the same as that of Ars where Jin used to be. However, the magic tools are expensive.

He wonders what to think about this.

(Are there no engineers or have they disappeared?).

And what is the reason for their absence?

(What is the reason for their absence?). Why are magical crystals so expensive? I wonder if we can go to ...... Lawhon to find out).

He must return to the world where Erza is waiting for him.

But Jin is still in the middle of the maze.

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