Chapter 195: Lu Huai's Geometry! Brahmagupta Model!
"What method?" Lin Yangyang's eyes sparkled.
Lu Huai said, "What we need to do now is to find another hidden location. Of course, it will be difficult to find it in a short time."
"But I've been thinking about this. Actually, this place only needs to meet two conditions."
Upon hearing this, everyone else looked confused, only Lin Zhiqing seemed to be thinking about something.
"Which two conditions?" Jiang Liuyun asked excitedly.
"Square objects all have four corners." Lu Huai pointed to the houses not far away: "Just like these houses in front of us, they all have four corners."
"That's right." Lin Shian nodded.
"I once encountered a dispute among the people." Lu Huai spoke quickly: "A businessman died and left a shop to his two sons."
"The shop faces south and has a great location."
"The two sons originally wanted to open two shops, each taking half. However, the businessman consulted an expert and learned that if the shop is separated, both cannot face due south, otherwise it will affect the feng shui and thus affect the business."
"In that case, wouldn't it be enough to hang one on the south and the other on the north?" Lu Nanyue was a little confused.
Lin Zhiqing shook his head: "If that's the case, the person who opened the store on the north side will definitely not be happy."
"That's right." Lu Huai continued, "The two sons were arguing and it went to the government. The Ministry of Revenue sent me to investigate."
"I proposed a solution: split the shop into two and then renovate it."
"The east corner of one shop and the west corner of another are adjacent to each other, while the other three corners are independent of each other. The door of one shop faces southwest, and the door of another faces southeast."
"Two houses next to each other?" Jiang Liuyun scratched his head, obviously not expecting such a place to exist.
Others were confused.
Wait... Lin Zhiqing frowned.
The "yu" in Lu Huai's dialect is the concept of "corner" in her understanding.
Translated, what Lu Huai said means that if two cubes are connected at a right angle, there will be a common vertex between the two right angles.
Extending vertically along the common vertex, two triangles can be formed above and below.
She had heard her teacher mention this geometric model in class.
What's it called?
Lin Zhiqing pinched his chin, it seemed like it was something or other.
She repeated it silently in her mind several times and finally remembered it!
Brahmagupta model!
If the name wasn't so complicated, Lin Zhiqing would never have remembered it after hearing it once.
She went over it again in her mind, and yes, it was the Brahmagupta model!
Thinking of this, Lin Zhiqing instantly understood what Lu Huai meant.
I remember it now, I remember it all.
Her teacher once gave an example to prove that mathematics can be found everywhere in life and is very simple.
In order to hit the target, snipers often have to consider conditions such as the height of the gun, terrain, wind speed, and the trajectory of the object.
Among them, the Brahmagupta model is often taken into account when considering terrain for snipers.
Because this kind of terrain can provide a good cover, ensuring that the sniper will not be discovered.
At the same time, as long as the position of the common vertex is determined, no matter where the target moves, the sniper can quickly make corresponding judgments and improve the hit rate.
How similar is this to their current situation?
Thank you to myself for not having a dream in class.
"I remember there was a house like this somewhere." Lin Zhiqing glanced at Lu Huai:
"There are two houses arranged like this not far from the entrance to the vegetable market. I observed them the last time we went to the execution ground."
"What we are thinking of should be a place." Lu Huai raised the corner of his mouth.
When he asked these questions in the past, neither his sister nor his father understood.
But Lin Zhiqing could quickly understand what he meant.
This kind of tacit understanding that came immediately to mind made Lu Huai feel extremely excited.
"There is no time to lose. We must go there as soon as possible, otherwise Liu Mang will be here soon. If we miss him, everything we have done today will be in vain." Lin Zhiqing looked at the others.
The others didn't understand the two people's riddle at all, but seeing that the situation was urgent, they didn't have time to ask more questions.
"What are you still standing there for? Let's go." Jiang Liuyun picked up the bow and arrow and was about to move forward.
But Lin Zhiqing grabbed him and said, "You're already injured. Don't move. Besides, you might have to go to the battlefield in the future. If you leave a root of the disease, it will be troublesome."
"Qing'er, I missed the target just now. No matter what, I must make amends!" He clenched his fists.
Everyone could see that he was under a lot of pressure.
Lu Nanyue glanced at Lin Zhiqing, then looked carefully at Jiang Liuyun's shoulder, then shook her head slightly: "Jiang Shizi, if you insist on moving around, you won't be able to lift this arm anymore."
"But..." Jiang Liuyun pursed his lips, trying to hold on.
Lu Nanyue interrupted him: "I'm a doctor. I know the condition of your shoulder better than you do."
"Brother Jiang, you should have a good rest. If something happens to you, how are we going to explain to Uncle Jiang?" Lin Shian advised earnestly.
"That's right." Lin Yangyang also spoke casually: "Don't worry, I'm here, I won't miss again."
Jiang Liuyun's expression suddenly became a little lonely.
"Ahem." Lin Shian pulled Lin Yangyang back.
"Don't think too much. Everyone makes mistakes sometimes. Fortunately, there is still a chance to make amends. The longer we delay, the less chance we have." Lin Zhiqing comforted.
Hearing this, Jiang Liuyun forced a smile: "Qing'er, I understand, you guys go ahead."
Lin Zhiqing smiled slightly and looked at Lin Shian: "Cousin, you and Nanyue stay here to take care of the prince."
Lin Shian and Lu Nanyue nodded in unison.
After giving the instructions, Lin Zhiqing picked up the child and walked to Lin Yangyang's side.
Lu Huai patted Jiang Liuyun's intact shoulder and walked over.
Then, as if remembering something, Lin Zhiqing looked at Lu Nanyue: "Nanyue, where did this child come from?"
"No one was willing to lend the child, so I contacted the child's parents. I had saved their lives before, and that's why I was delayed for a while."
Lin Zhiqing nodded and didn't ask any more questions.
At the same time, Lin Yangyang was about to take the bow and arrow, but was stopped by Lin Zhiqing:
"Cousin, this thing is no longer needed, let's go."
Lin Yangyang decisively gave up the bow and arrow.
Several people quickly found horses and rushed towards the entrance of the vegetable market.
What Lin Zhiqing didn't expect was that although Lu Huai looked like a weak scholar, his horse riding speed was not slow at all.
But she changed her mind and realized that children of powerful people like Lu Huai had been specially trained since childhood.
Lu Huai is good at mathematics, but that doesn’t mean he only knows mathematics.
Who doesn’t have some unique skills?
Putting these thoughts aside, Lin Zhiqing hugged Lin Yangyang's waist tightly.
After trying their best, they finally overtook Liu Mang.
After reaching the side of the two rooms in one go, Lin Zhiqing handed the child to Lu Huai.
The two men dismounted and discussed for a while, and the expression on Lu Huai's face changed from confusion to sudden enlightenment.
Then, he carried the child into the gap between the two rooms and disappeared after a while.
After Lin Zhiqing mounted his horse again and walked about a hundred steps behind the gap with Lin Yangyang, the two of them stared at the gap closely without being distracted.
"Cousin, you must aim at the gap between the two rooms later. Don't miss!" Lin Zhiqing reminded.
"Don't worry, Fourth Uncle's life is in our hands. I won't be careless." Lin Yangyang waved her hand.
"But..." She frowned: "Without a bow and arrow, what can I use to fight Liu Mang?"
"Use this." Lin Zhiqing took out something from his waist and then opened his palm.
A slingshot lay quietly in her hand.
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