C145 erudition

At that moment, Xiao Wen looked at Sun Shangxiang's green face that was filled with fear. He really wanted to bring Guan Yu here and let this kid, who frightened Sun Shangxiang, help him deal with her.

However, considering that Sun Shangxiang was the daughter of a marquis, he gave up on this idea.

"As long as you can endure these few days. It's completely unnecessary to train her personality in the meantime. "

Xiao Wen thought.

Furthermore, if Guan Yu was allowed to come over, it would be enough to deal with Sun Shangxiang's bad temper. However, Guan Yu had attacked without too much of a fuss. If something were to happen, it would become troublesome.

After all, Guan Yu had knocked her out the first time he had met Sun Shangxiang.

If he stayed with Guan Yu for too long, Xiao Wen wouldn't be able to guarantee that Sun Shangxiang wouldn't lose an arm or a leg.

After all, in this world, Sun Shangxiang was not Liu Bei's wife or Guan Yu's sister-in-law.

Guan Yu will not show mercy to her.

Seeing Sun Shangxiang's frightened look, Xiao Wen smiled and comforted him: "Don't worry! As long as you're not being naughty, I won't let Guan Yu come over. "Remember, you can't be naughty."

"This …" Hearing Xiao Wen's words, Sun Shangxiang once again revealed a frightened expression.

"Did you hear everything I just thought?"

"You're too scared to say anything." Xiao Wen rolled his eyes and said helplessly.

"I... I'm not afraid of Guan Yu! " Sun Shangxiang's face was red as she argued with Xiao Wen.

As she said this, she even showed a "I'm extremely fierce" expression.

Un, it was just like a little cat that was pretending to be a fierce tiger, roaring at Xiao Wen.

Xiao Wen said: "Well, I'm so scared, I'm scared to the point of peeing my pants..." No wonder!

Seeing Sun Shangxiang like this, Xiao Wen couldn't help but smile.

However, he still said, "Since I'm already here. I can't just sit here and be in a daze with you, right? "

"You can squat. It would be even more pleasing if you could kneel. " Sun Shangxiang said coldly.

"What?" Xiao Wen was surprised, he didn't expect Sun Shangxiang to answer him like this.

However, after calming down, he still said, "It seems that there is still a generation gap between you and me. Since that's the case, I'll let Guan Yu play with you! "

"You are of the same age after all, and you also love martial arts. You must have a lot in common."

After saying that, he pretended to be about to turn around and leave.

At this moment, Sun Shangxiang's face immediately turned pale.

"No!" She shouted at Xiao Wen.

Because of her fear, her voice was no longer as cold and stiff as it usually was. Instead, it had a hint of softness to it.

Sure enough, under every appearance of being unruly and willful, every loli also had a girl's heart.

She was no different from any other girl when it came to people or things she feared.

Seeing Sun Shangxiang's expression, Xiao Wen raised his chin and revealed a proud expression.

"This girl is indeed afraid of Little Yu the most." Hm! As long as we can find the right way, even the most headstrong and headstrong children will become well-behaved. " Xiao Wen inwardly laughed.

At the same time, he said in an excited tone, "Since you don't want Guan Yu to come, you must act as if you have something in common with me. Otherwise, if I'm worried that you'll be too bored by yourself, I'll have Guan Yu accompany you! "

Hearing this, Sun Shangxiang quickly waved her hand and said: "Don't worry, although I like to play with swords and spears, but I also have a talent for literature. I could read at the age of three, and at the age of eight I could write down the entire moral scriptures without missing a word. Four Books, Five Classics, Military Law, Agricultural Books, Astronomical Geography, I'm proficient in everything! "

"Really?" Xiao Wen raised his brows. He didn't expect Sun Shangxiang, this unruly and headstrong girl, to have the side of a literary girl.

Looking at Xiao Wen's expression, Sun Shangxiang confidently lifted her head and stuck out her chest, saying: "Of course, there are many books in this lady's house. Maybe I've read more books than you have! "

"Oh!" If an adult were to act so arrogantly in front of him, Xiao Wen would definitely use extreme methods to deal with him.

However, Sun Shangxiang was only a child. If he treated her like an adult, then it would be a waste.

Thus, Xiao Wen just asked in a low voice, "Since you know about astronomy, do you know how long it takes for a beam of light to travel from Altair to Vega?"

"Light and speed?" Hearing this, Sun Shangxiang was the first to ask in surprise.

"Of course." Xiao Wen replied, "Seventy two million Li per hour."

An hour was equal to two hours, and a kilometer was equal to two miles. After a simple calculation, Xiao Wen could use a unit that Sun Shangxiang understood and explain to her.

"Then …" Although it was the first time Sun Shangxiang had heard of the concept of light speed, she seemed to still want to fool around.

Therefore, she said, "For the speed of light to be so fast, it must have happened in an instant."

"No." Xiao Wen shook his head.

"A cup of tea?"

"Not so fast."

"An incense stick's worth of time?"

"Still fast."

"That was an hour, it can't be a day, right? After all, the Cowherd's Weaver only meets once a year. "

"You may not believe it. a total of sixteen years and five months. " Xiao Wen said with a smile.

The Cowherd is a Heavenly Eagle, and his western name is Altair.

The Weaver is Alpha of the Heavenly Zither, or Vega.

The distance between them was 16.4 light-years. Thus, the legend of the Cowherd's Wife could not be realized.

"I'll test you again."

Xiao Wen looked at Sun Shangxiang and asked his second question: "What's the number of decimal points after the round rate?"

"The last nine?" Hearing this question, Sun Shangxiang once again revealed a surprised expression.

She said, "I know about this, but even the ancestor of that small country could only calculate the ratio to the last seven. How could anyone know about the bottom ten? "

Xiao Wen slightly smiled.

Indeed, in history, in 263 A.D., the Chinese mathematician Liu Hui used the "circumcision technique" to calculate the circumference ratio.

He said, "The finer the cut, the less lost the cut, the more cut, so that it cannot be cut, and the circumference is merged with it, and there is nothing to lose.", which contains the thought of reaching the limit.

Liu Hui gave an approximation of the circumference of pi = 3.141024. After getting the circumference of pi = 3.14, he examined this value with the diameter and volume test of the copper volume scale standard Dendrobium (Dendrobium vulgare) made in the Jin Dynasty. It was found that the value of 3.14 was still small.

So he continued to cut to the 1536 profile and got the area of the 3072 profile, which gave him a satisfactory ratio of circumference — 3.1416.

In about AD 480, Zu Chong, who was born in the period of the Southern and Northern Dynasties, was calculated and the result of the seven decimal places was obtained. The shortcoming approximation value 3.1415926 and the excess approximation value 3.1415927 were given.

Then, at the beginning of the fifteenth century, the Arabian mathematician Cassie broke Zuchong's record of nearly a thousand years by obtaining a small, precise 17-bit ratio.

Then the German mathematician Rudolph van Ceulen calculated the pi value to 20 bits in 1596, then spent his whole life calculating 35 digits after the decimal value in 1610, which he called the Rudolf number.

However, as long as it was someone who had received primary education, they should be able to remember the numbers of the last ten decimal places.

Without even looking at the library, Xiao Wen blurted out, "3.1415926535."