"Ah...... Brother Xiao Ming ......" And at this moment, Ruolan seemed to suddenly think of something, suddenly looked back at Xiao Ming, shouted, and disappeared with Xiao Yan in this white light.

The light dissipated, and the stone wall returned to its original shape, but the original geometric shape became much smaller. Except for Ruolan's last shout just now, it was as if nothing had happened.

"What's wrong?" and Xiao Ming, who was cultivating, heard Ruolan's shout in a blur, and quickly opened his eyes.

The fire in front of him was still there, but Xiao Ming looked around and didn't find Ruolan and Xiao Yan.

"Ah...... Old Chen, what just happened?" Turning around, Xiao Ming saw Old Chen floating above his head, and hurriedly seemed to grasp a life-saving straw.

"Hehe, it's okay, just now it was Ruolan and Xiao Yan's kid, go over there to unseal something, the seal was unsealed, and they happened to be sucked in. Old Chen pointed to the empty wall over there.

"Seal, what seal?" Xiao Ming looked at the empty wall, and his heart was puzzled.

"Oh, this is Xiao Yan's kid who found it, just an hour ago, he found a seal on the wall, and then, he seemed to say, what treasure is behind this wall, and then he and Ruolan where are they to unlock the seal, now that the seal is broken, they may be sucked into the opposite wall. Chen Lao explained.

"Ah...... There are still seals on this wall, so Ruolan and Xiao Yan were sucked in, is there any danger?" Xiao Ming opened his mouth, he couldn't think of any seals here, he quickly stood up, and Xiao Ming walked to the wall. Although his injuries were only about a fifth of the way better, he was now moving on his own.

"There is no danger in danger, Xiao Yan has so many secret weapons, I believe he will definitely protect Ruolan...... It's just that, generally speaking, where there are good treasures, there are usually fierce beasts or heavenly demons guarding them, which I can't guarantee. Chen Lao said with some hesitation.

"Ah...... In that case, Ruolan may still be in danger?" Xiao Ming became anxious when he heard this.

"It's possible. Chen Lao nodded.

"Then I'll go in too, Old Chen, this place, how to get in!" Ruolan's safety is something that Xiao Ming is extremely worried about, and now Ruolan seems to have been deceived by Xiao Yan, who is not good or bad, it is like Xiao Yan snatched Xiao Ming of something, which makes Xiao Ming very uncomfortable.

"This is not in a hurry, how much have you recovered now?" Chen Lao did not immediately agree to Xiao Ming, but looked at Xiao Ming.

"It's recovered, Old Chen, why are you asking this?" Xiao Ming said.

"That's it, your current state, what can you do if you go in, the top priority now is to recover your strength quickly, and then take this opportunity to go to the battlefield outside to hone your cultivation that you have just promoted to the third grade, and stabilize your cultivation, you are going in, by the way, I will also teach you some formulas, triangle formulas, square formulas, these you can't yet, and you won't unseal them." Chen Lao said.

"Ah...... Do you want to do this?" Xiao Ming looked disappointed.

"Of course, when did I lie to you, and besides, with your cultivation, you are not even as good as Xiao Yan, if they encounter any danger, you still can't help? Do you want to use Gauss Plus again, which makes your whole body weak?" Chen Lao spread his hands and said.

"Okay, I'd better go ahead and recover. Xiao Ming sighed, if the frosted eggplant was as spiritless, returned to the fire.

"This is Ruolan's sister's book......" As soon as Xiao Ming sat down, he saw Ruolan's language book next to him.

"Alas...... It's hard to meet, and this is going to be separated...... "Xiao Ming put Ruolan's book in his bag, then adjusted his spirit, closed his eyes again and began to recover.

————

In the blink of an eye, three days have passed.

"Old Chen, now I should be able to unseal it. Xiao Ming stood in front of the stone wall and said a little impatiently.

"Well, of course there is no problem, you have stabilized your cultivation in the past three days, and now that you have mastered the area formula of the basic figure, you can give it a try. Elder Chen nodded.

After the day, Xiao Ming had already recovered, and then under the guidance of Chen Lao, Xiao Ming pounced on the battlefield again, and fought with the Heavenly Demons, after stabilizing Xiao Ming's cultivation in the middle of the third grade, Xiao Ming couldn't wait to come to the stone wall again.

For three days, every day Xiao Ming would look forward to Ruolan if they would come out of here again, but he was disappointed, Ruolan and they went in again, and there was no sign of coming out, this situation made Xiao Ming worried, so just stabilized his cultivation, he had already come to the stone wall.

The geometric figure on the stone wall has become a lot smaller, I don't know if it is because it has been unraveled, the figure displayed in front of Xiao Ming is ten times smaller than the figure that Xiao Yan and they faced before. However, even so, Xiao Ming still needs to calculate the circumference, area, and so on of the entire figure before he can open the seal.

"Go ......" Xiao Ming took out the ruler that they had found on the fourth-grade powerhouses they had killed three days ago, and as Xiao Ming drank in a low voice, the ruler leaned towards the figure on the wall.

"Old Chen, remember, the waist of this triangle is 5, the bottom edge is 8, the side length of the square is 8, the length of the rectangle is 10, and the width is 1. Xiao Ming quickly measured the side length of the shape, which had been reduced several times.

"The circumference of a triangle is 18, the circumference of a square is 32, and the circumference of a rectangle is 22. Xiao Ming took out a pencil and scratch paper, and quickly calculated the circumference of the figure.

"The formula for the area of a square, multiply the length of the side by the length of the side, the area of the square is 64, the area of the rectangle is 10, the area of this triangle, the base edge multiplied by the height divided by two, is 5 times the ...... Hey, Old Chen, I don't seem to have measured the height of this triangle......" When Xiao Ming calculated the area of the triangle, he also encountered a problem like Xiao Yan.

"Hey, this high, you don't need to measure it, you just need to use the Pythagorean theorem to calculate the height, 3, 4, 5, which is exactly the pure Pythagorean number, you don't need to calculate it. The height of this triangle is exactly 3, you don't have to count it now...... "It's not that Chen Lao doesn't want to give the Pythagorean theorem to Xiao Ming, but Xiao Ming's current third-year cultivation is not enough to comprehend the axioms of theorems or something. Therefore, he directly told Xiao Ming the result.

"Three...... Pythagorean theorem?" Although Xiao Ming's mind was puzzled, he didn't ask this time, because time was of the essence.

"Since it is three, then the area of the triangle is eight times three and divided by two, and the result is 12, and the area of the triangle is twelve!"

"Calculated that the area of the square is 64, the area of the rectangle is 10, the area of the triangle is 12, and the total circumference of the whole figure is 56." Xiao Ming looked at the numbers on the scratch paper, and then slowly stood up.

"Old Chen, I only need to type these correct numbers on the graphics now, and I can unlock the seal. Xiao Ming pulled out his pen and said.

"Well, theoretically, but remember, try to type those numbers in a second. Chen Lao nodded.

"Okay, in that case!

The next moment, Xiao Ming's dantian's Chinese characters were divided into two strands, and Xiao Ming's whole person flew up like a big peng spreading its wings.

"12, 64, 10, 56!

In less than half a second, Xiao Ming instantly used a pen to outline accurate numbers in the air.

"Boom ......"

After these accurate numbers were printed on the geometric figures on the wall, the wall was filled with another muffled sound, and the next moment, the wall slowly cracked again.

Then, a soft light shone on Xiao Ming, and Xiao Ming only felt a pull coming from the entrance of the cave.

"Sister Ruolan, I'm here!" Xiao Ming didn't resist, but kicked his feet and sank into the hole at a faster speed.

......

............

"Is this the inner space of the cave?" After a burst of white light in front of him, Xiao Ming opened his eyes, and as soon as he opened his eyes, he saw that in front of him, nine cave openings appeared, and other than that, there was nothing more. The nine holes are plain and white, and they also exude a soft light, indicating that Xiao Ming wants to make the right choice among these nine holes.

"Chen Chen...... What should I do now?How do I know which direction Sister Ruolan is going?" Xiao Ming didn't expect that there were nine roads in front of him, and he had no choice but to ask for help from Old Chen.

"This ...... What is hidden in this space?" Chen Lao looked at the scene in front of him, and he also frowned. Facing the nine holes that appeared in front of him, Chen Lao didn't have any way.

"Old Chen...... Old Chen, which cave should we go to next?" Xiao Ming saw that Old Chen didn't seem to hear it, and repeated again.

"Uh...... Choose any one, I don't know, which hole do you think Ruolan will take, you can choose any one, so far, since you have come in...... Moreover, there is no way back behind them now......" Chen Lao turned around, and behind them was a pitch-black wall, and there was nothing.

"That'...... Well, I'll choose the middle one. Xiao Ming bit his lip, and the next moment, he pointed to the hole in the middle and said.

"Okay, let's go!" Chen Lao naturally had no objection, after all, it was the first time he had come here.

"Sister Ruolan, I hope you are in this cave~!" Xiao Ming took a deep breath, he was also a little apprehensive in the face of the unknown road ahead, but for Ruolan, he still resolutely stepped into the unknown hole in front of him.

"Toot toot toot toot...... Tick ......"

Xiao Ming only felt that when he stepped into the hole, his feet touched a membrane, and then Xiao Ming's eyes were filled with darkness again, after a strange sound, a ray of sunshine, pure and bright sunlight shone into Xiao Ming's eyes, and then, Xiao Ming's nose asked a familiar smell of flowers and plants.