Demon King, you just need to conquer, and your husband will come up with the solution.

The four dragon wings flapped gently a few times, bringing up a majestic air wave, and then moved down to lightly cover the body blocked by the dragon's tail, and expanded as quickly as the dragon's tail.

In just a few breaths, when the body covered by the dragon wings grew to more than ten meters high, Finia finally spread her dragon wings again, revealing her magnificent original form as a demon dragon to everyone.

On the raised dragon head there are a pair of black-gold dragon horns that are intertwined like a crown and emit golden light.

Under the slender dragon neck is a huge yet beautiful streamlined body covered with dense and smooth black dragon scales.

The two pairs of wings on the dragon's back spread out front and back, one large and one small, and spread over everyone's heads, making people feel as if it had the power to cover the sky and the sun, and it looked extremely majestic!

This creature, full of power, dominance, and beauty, made Ains lose his mind for a moment. Is this the legendary creature... It is really extraordinary...

Chapter 90: Experts among the People

"This is the dragon clan..."

Seeing Finia reveal her true form as a dragon, Irons couldn't help but sigh.

Margaret corrected him, "It's not the dragon clan, Ains. Finia will be unhappy if you say that. The magic dragon clan never recognizes that the dragon clan is the same as them, and they have a blood feud with each other for thousands of years."

"Oh oh..." Irons nodded quickly and closed his mouth, but he leaned over to Margaret's ear and whispered, "But I feel like these two races really look alike..."

"They all have the same ancestor, so of course they look alike. But for some unknown reason, they parted ways. And the parting was very fierce. They would fight each other whenever they met. So you can't say such things in front of the dragon."

Margaret responded quietly. The two of them didn't want to use magic to communicate their conversation privately, so Finia didn't hear it.

Finia's voice became much deeper after she revealed her true form. She lowered her head and said to Irons, "Sir Irons, get on my back. I will take you to the sky."

……

"Raphael, let me tell you, to draw a map, we must first determine some scales. Well, take the size of this drawing as a reference, and the size of the entire Demon King's City.

I think the scale should be set at 50000:1, which means that one thousand meters drawn on the drawing is 2 centimeters long, and the size of this parchment is 1.5 meters long and 1.2 meters wide.

Therefore, the scope we want to survey is the entire area surrounding the Demon King's City, which is 75 kilometers long and 60 kilometers wide.

Well, according to the size of the Demon King's Castle, which is 3 to 4 kilometers square, its scope can be divided into blocks. Then..."

Margaret sat aside, watching Ains showing such a huge Demon King City on the map in just a tiny amount, and couldn't help asking, "Isn't it... the map of the Demon King City... the Demon King City is only the size of a palm? That's not good..."

After hearing this, Ains patiently explained to Margaret: "Margaret, what we are going to draw now is a strategic map, not a city map. What we need to show is the geographical layout around the Demon King's City, not the Demon King's City.

In the map we are going to draw now, the Demon King's Castle is just a central landmark, not the main part. In fact, if possible, I would like to draw it at a scale of 100000:1, but that would be a bit too much work. "

"100000:1? Then the Demon King's Castle... wouldn't it be that only a small piece is left?"

"Hmm." Irons nodded and admitted, "In some of the later maps, the Demon King's Castle will even become a small dot."

"Oh... Well, I don't really understand this, I'll just listen to you, Ains..."

Although she felt a little disappointed that the Demon King's Castle could only be shown in a small spot on the map, Margaret still chose to follow Ains' advice.

Seeing this, Irons laughed, touched Margaret's head, and comforted her: "Don't worry, Margaret, it's just a strategic map this time, and a city layout map will be drawn later. By then, the whole map will only show your favorite Demon King's Castle~"

Margaret was slightly surprised by Irons' comfort and pat on the head. Her cheeks turned red. She nodded with some joy and whispered, "Hmm~"

But this made the painters nearby sweat profusely. Wow, this is something that these painters can only look at! ?

For a moment, the painters' desire to survive was instantly filled. They all turned their heads away. Some looked at the sky, some looked at the clouds, and some counted the dragon scales on the dragon's back. Well, these dragon scales were real dragon scales!

After pacifying Margaret, Irons and a group of painters observed the layout of the Demon King's City below, and began to discuss how the map of the entire Demon King's City should be divided into surrounding blocks.

To draw a map, it is not enough to just look at the sky. Everyone must agree on the scope of the map in the sky and mark the positioning points on parchment with charcoal.

Everyone returned to the ground and began to observe the structure of the terrain around the Demon King's Castle.

After observing for a while, Ains pointed to the North Wind Plateau not far from the Demon King's Castle and said, "The height of the North Wind Plateau also needs to be measured."

"Um... why do we need to measure the height? Is it necessary to draw the height when drawing a map?"

Margaret was somewhat puzzled by Irons's stringent requirements for the new map. It was the first time she heard that drawing a map required including the height.

But how is it possible to draw the height using only a floor plan?

Irons said, "Of course we need altitude, Margaret. Maps not only show the plane layout of the entire landscape, but also need to show the changes in the height of the terrain. Previous maps did not need this, but future maps will definitely include this."

"Wow...but it's just a floor plan, how can we show the height?"

"Depend on the contour lines."

“What are contour lines?”

"Hmm...ha, that's great, Mr. Raphael, you guys come over and listen, I'll explain it to you..."

Taking advantage of Margaret's opportunity to ask questions, Irons pulled a group of painters together and began to explain to everyone the role and drawing of contour lines.

The principle of this thing is not difficult, it can even be said to be very simple, but it is quite clever.

As Irons explained, everyone understood the method and principle. Margaret clapped her hands in sudden enlightenment and exclaimed, "Amazing! Drawing a few circles can actually show the height!"

"The principle is indeed simple, but the effect is not simple at all. The contour lines can be used to determine the terrain changes of the entire area. This is of great strategic significance during wartime and cannot be taken lightly."

"Well... I understand. But how should this height be measured?" Margaret asked Irons again.

But this time, the omnipotent Ain Amen could not give any brilliant answer. He shook his head helplessly and said, "I really don't have any particularly good ideas. All I know is the shadow determination method, but we can't see the sun in the Demon Realm, so we can't even use the shadow determination method..."

Just as Irons shook his head helplessly, the little devil painter Raphael came forward and whispered, "Um... measuring the height... maybe I can..."

"Ok?"

Raphael's words immediately attracted everyone's attention. Irons stepped forward and asked, "Mr. Raphael, you said you have a method to measure height? What is it?"

Raphael smiled awkwardly and explained, "Uh, haha, to be precise, it's a tool... I'm a landscape painter who advocates realism, so I'm a little bit... obsessed with the true proportions of the scenery.

So for this reason, I tried to make a tool specifically for measuring the height ratio of scenery. Ah... Actually, it can't measure the height directly, it can only measure the ratio. But I can guarantee that the height ratio measured by it is absolutely correct! "

"..."

Irons and Margaret looked at each other in bewilderment. Was this like handing over a pillow when you are sleepy? The person who could solve the problem was right next to them... These painters that Finia had found were really talented!

Moreover, a painter could make an altimeter by hand? Hiss... It didn't seem incredible. After all, there was a genius painter named Leonardo da Vinci in his previous life who could make all kinds of wonderful inventions by hand.

Could it be that the profession of painter is a designated profession for the ruthless people in Tongliao, similar to engineer?

Although he was unsure of the authenticity, Irons couldn't help but get agitated. He quickly said, "As long as the proportions are correct, the height can be calculated mathematically!"

Mr. Raphael, where is your studio? I want to see what your tool for measuring proportions looks like! The tool you invented may be used for more than just measuring height! "

Chapter 91: Archimedes in the Demon Realm

At the request of Irons and Margaret, Raphael quickly moved the measuring instruments out of his studio.

From the appearance, this rangefinder is very similar to the structure of a telescope, but unlike a stargazing telescope that is tilted upward, the starting position of this rangefinder is horizontal, and there is a knob to adjust the telescope to tilt upward.

In addition, there is a scale placed in front of the telescope, but normally it is folded in front of the telescope.

The structure of the entire rangefinder is quite simple, even a bit crude. After Raphael showed the instrument to Irons and Margaret, he began to tinker with it and demonstrate how to use it.

"This instrument is very simple to use. I have engraved a center line inside the telescope. Observe the building through the telescope, and then adjust the telescope upward little by little until the center line in the telescope is aligned with the highest point of the observed building. Of course, before that, we must adjust the telescope to a horizontal position..."

As he spoke, Raphael adjusted the level of the entire telescope, and his method of adjusting the level was quite clever.

He hung a small glass water bottle next to the telescope, and the water level in the bottle always remained level. All Raphael had to do was to align the axis engraved on one side of the telescope with the horizontal water level line, so that the telescope could ensure that the starting point of observation was in a horizontal position.

This simple and ingenious standard method made Irons couldn't help but praise it in his heart. The configuration of this instrument was quite simple, but it revealed Raphael's ingenuity everywhere.

After Raphael adjusted the instrument to zero horizontally, he began to observe the North Wind Highlands not far away.

Raphael put his eyes in front of the telescope and adjusted the upward angle of the telescope little by little, finally aiming the markings in the telescope at the high point of the North Wind Highlands.

Then, he fixed the angle of the telescope, stood up the folding scale in front of the telescope, and continued to explain.

"Then, we stand up the scale in front of the telescope, and the scale will appear in the field of view of the telescope. Then we look into the telescope to see which mark on the scale the middle line is aligned with."

Raphael observed the ruler again and said, "The scale we observe from the telescope now is 16 centimeters, and the vertical point of the ruler is fixed at 1 meter from the observation point. In this way, I can immediately get the ratio of height and distance."

Irons, who was very familiar with basic geometry and proportion, understood the operation of Raphael's instrument for measuring proportions almost instantly.

He couldn't help but applaud Raphael and exclaimed: "Mr. Raphael, I never thought that a math expert like you would appear in the Demon King's City!"

Although the principle of this instrument is very simple, so simple that it is just the elementary school mathematics knowledge of Ains in his previous life, but the background where Raphael rubbed this thing with his hands is the Demon King's Castle!

The devil's city where every person fails to complete prenatal education! In such a Feng Shui treasure land, a master who can rub the measuring instrument with his hands can appear. This is at least a prophet of Archimedes' level!

Margaret, who was standing by, scratched her head, a little confused. What did that mean? Just tilt the telescope and put the ruler upright, and the height can be measured?

She touched Ains' shoulder a little embarrassedly and muttered, "Ains, I don't think I understand it very well. How can you measure it now?"

Irons chuckled, took out a notebook and a feather pen from his pocket, drew a right triangle, and explained the principle of right triangle geometric proportions to Margaret.

The principle of this knowledge was not difficult, and Margaret was quick to learn it. After a brief explanation, she had a general understanding of it.

She clapped her hands in sudden realization and said, "Oh~ That is to say, with the 100:16 ratio measured by Raphael, we only need to measure the distance between us and West Wind Highlands to calculate the height of West Wind Highlands! Is it so magical!?"

“This is mathematics~”

Irons smiled slightly, then looked at Raphael, who looked a little shy at the moment.

In fact, he originally wanted to show off, explain the principle of this instrument, and demonstrate his presence in front of the Demon King.

But he didn't expect that the human in front of him could deduce the principle of the entire instrument with just one glance, and even explained it more clearly than he had figured out himself.

This way Raphael wanted to show off his little thoughts, which seemed a little embarrassing.

Irons patted Raphael on the shoulder and praised him, "Mr. Raphael, your measuring instrument is very good. I want to ask, have you ever studied mathematics before?"

"Mathematics? This... that, Master Ains... I have been learning how to draw since I was a child. Mathematics... I really have never learned it..."

"Never learned it?" Irons raised his eyebrows. How could he make this thing without learning it?

Irons couldn't help but feel curious. He asked, "How did you make this instrument?"

"I..." Raphael's expression became dazed after being asked by Ains. He kept his mouth open for a long time before finally answering, "I... I saw it."

"See? See what?"

Raphael replied: "It is what you just drew in your notebook, Mr. Irons... I was stuck in the bottleneck of how to create depth of field in painting.

During that time, I was troubled every night by the strange configurations created by the distance between objects... and couldn't sleep...

Those buildings and scenery are abstracted into lines and squares in my mind, which keep echoing in my mind...

Maybe it was just a flash of inspiration... In my random thoughts, I saw what you, Mr. Irons, just drew in your notebook.

So... I tried to make this measuring instrument with the intention of giving it a try... Although, in the end, this thing didn't really help me much in painting."

Listening to Raphael's description, which even had a hint of metaphysics, Irons' expression became subtle.

If it is true as Raphael said that he had never systematically studied mathematical geometry, then from his description, he was obviously a genius who was born with a very keen sense of mathematical geometry.

However, the cultivation of genius also requires nutrients. Unfortunately, the Demon Realm does not have such nutrients. The Demon Realm can cultivate painters, but there is no soil to cultivate mathematicians, because the Demon King City does not even have a school in the strict sense.

Thinking of this, Irons looked at Raphael with a serious expression, and asked seriously: "Raphael, do you like geometry and mathematics?"

"Ah? This..." Hearing Ains's question, Raphael's expression became subtle, and he muttered hesitantly: "This... Actually, I'm not too sure. After all, I have been studying painting for decades...

This geometry is just some small thoughts that can't be stopped in my mind... I can't say that I like it very much, I just can't help thinking about it in my mind..."

"Being willing to think and do it shows that you are different from ordinary people. Raphael, do you feel comfortable immersed in that world?"

"Ah, this..." Raphael was slightly stunned. He looked around at the others. After some hesitation, he nodded and admitted, "Yes... I really like to immerse myself in that world..."

After receiving Raphael's recognition, Irons nodded and asked again: "Raphael, what are your artistic attainments?"

"I... it's hard to say. Many people say that my paintings are very realistic, but my teacher always criticizes that my paintings are too rigid and lack my own subjective expression...

In fact, the restoration of reality is what I want to express, but my teacher doesn’t think so, so in the eyes of many masters, my paintings are not worthy of being considered as elegant. "

"In that case, I understand, Raphael, you actually prefer objective and rational things... Then, perhaps you can try another field... Raphael, are you willing to go to the human world to study mathematics?"

"Go... to the human world!?"

Hearing Ains' question, Raphael's expression showed a trace of retreat. He shook his head and said, "I have never been to the human world. I am a demon and I want to go there to study... I feel that I may not be able to do it..."

Irons waved his hand and comforted him, "You can rest assured about this. Warden Sophia is very experienced in this. I will let Sophia teach you how to live and disguise in the human world. I can also assign you some bodyguards to protect your safety.

The conditions don't really matter. As long as I give the order, Margaret can mobilize the best resources in the Demon Realm to allow you to study abroad in the human world. So, exclude these conditions that you have and ask yourself carefully.

Raphael, do you want to continue to suffer in an industry that is actually somewhat incompatible with you, or choose to follow your inner desire and explore the new world that has always been calling you? "

"...I..." Raphael bit his dry lips. After some tangled thinking, he took a deep breath and made up his mind: "Mr. Irons...I...I want to explore that world!"

Chapter 92: Demon Realm Study Abroad Plan