"Why do I just want to listen to lectures now?"

Ma Xiaotian thought very puzzled, although he had such thoughts in his heart, but his eyes never left the projector for a moment, that originally very ordinary animation, as if some kind of magic had been applied, people never get tired of watching it, and every time you watch it, there will be a new harvest!

"That's how the focus of the parabola turned out!"

"The eccentricity e of a parabola is always equal to 1!"

"The alignment equation is actually x=-p/2!"

…………

Although the animation of cutting the cone is continuous, there is no stop in the middle, only occasionally there are local close-ups, but in the eyes of everyone below, these animations are broken down into frame by frame, and the originally very abstract term concept becomes very vivid under such a decomposition!

It turns out that a parabola is the trajectory of a point in the plane that is equal to the distance to a certain point and to a fixed line that is not at this point!

It turns out that the fixed point is called the focus of the parabola, and the fixed line is called the parabolic alignment!

It turns out that the diameter of the parabola is the trajectory of the midpoint of a group of parallel strings in the parabola, and this diameter is also called the conjugate diameter of this group of parallel strings. That's how the conjugate diameter came about!

Without any additional explanation, students quickly understand these properties, and if they have a good foundation, they can even expand the quadratic properties through such decomposition, even if they have a poor foundation, they can fully grasp the most basic concept of parabola!

"Now that I've watched the animation, let's summarize how a parabola is defined. Tao Li's voice drew everyone's attention back to him.

Even though there was less than two minutes of animation, everyone felt like they had watched a two-hour movie!

A feast for the eyes!

Even the 3D movie "Avatar", which is known as the most well-made and expensive in the history of film, is not worth mentioning and vulnerable in the face of this animation!

That kind of immersive three-dimensional feeling, that kind of touch around the body, Ma Xiaotian feels that he will not have a second time in his life!

If you use this effect to watch an island country action movie, wouldn't it be a night and night shengxiao, let alone a second spring, a third spring, and a fourth spring...... It's all possible, the kind of teacher who surrounds you, clings to you, and all kinds of delightful voices...... cough cough (omit 10,000 words here, in case you are more stone and water shown)

If Ma Xiaotian was surprised, then Yang Zhongming, Chen Ke and the others were shocked beyond measure! Especially Yang Zhongming, he really couldn't understand how Tao Li did this!

Especially when watching the animation, the kind of picture that decomposes the parabola into every detail makes Yang Zhongming feel shocked!

When did it have such a teaching effect!

What's ridiculous is that he was still thinking about replacing Tao Li and letting other teachers replace him in class, and then looked at Ma Xiaotian beside him, with undisguised joy on his face, Yang Zhongming was glad for a while, otherwise he would really regret not being at the beginning!

Different from the shock of others, the two Education Bureau staff standing next to the camera at this moment felt a burst of chagrin in their hearts, just two people patronized to watch the animation, but completely forgot to adjust the focus, change the lens, and missed the most perfect shooting shot!

"Next time, you must pay attention, you can't just look at your face...... Oh no, it's an anime...... Why is my face full of brains now...... But this teacher is really good-looking!"

The photographer who pointed the camera at Tao Li, he was embarrassed to look up at Tao Li directly, and could only secretly admire Tao Li's prosperous beauty through the lens, and he was still fantasizing about Tao Li making up for his lessons......

Classes continue!

After the animation was broadcast, Tao Li began to write on the board! The arrangement of this lesson was originally based on board books, supplemented by multimedia courseware, drawing, writing, typesetting, and Tao Li did the same, which had to attract Ma Xiaotian and several other people from the Education Bureau to be amazed!

Especially when Tao Li was drawing, he used both hands at the same time, and the brush brushed to draw two exactly the same parabola, the size, height, and thickness, which were simply carved out of a mold!

Ma Xiaotian even felt that the figures drawn on the geometric drawing board were not as beautiful as Tao Li's lines!

Pictorial board technology!

Although they have already seen the skills of Tao Li's board book, but now that they read it again, Chen Tianxiang, Yang Zhongming and others still feel very amazing! Not to mention Chen Ke and Ma Xiaotian, who saw such a beautiful board book for the first time, it is estimated that their eyes are about to pop out!

"Cut! hillbilly, you haven't seen Mr. Tao's stunt of drawing a circle with his left hand and drawing a square with his right hand, I guess it will make you cry at that time!"

Looking at the scorching eyes of Ma Xiaotian and others, Yang Zhongming's heart was full of superiority at this time!

And the two photographers also learned the previous lesson, and while appreciating Tao Li's class, they did not forget to complete their own work, focal length, aperture, and exposure...... They strive to be the most accurate in each item, and the beauty of the Tao Li in the lens is that when they take pictures of their female pot friends, they have never been so attentive!

It's strange to say, they originally hated classes the most, but today's class actually listened to it with relish, and it seems that it's time to consider an adult education!

More than half of the time of the lesson has passed, and Tao Li is now summarizing the coherent properties of parabolas, and at the same time listing the images and properties of ellipses and hyperbolas!

Ma Xiaotian thought that drawing a parabola with both hands at the same time was already very powerful, and when he saw Tao Li draw an ellipse with his left hand and a hyperbola with his right hand, and both hands started and ended at the same time, Ma Xiaotian felt that he must be dazzled!

"Could it be that he is the personal disciple of the old naughty boy Zhou Botong?!"

Ma Xiaotian sat there dumbfounded, muttering.

Ma Xiaotian had almost forgotten that this was the first time he had been shocked in this class, whenever he thought that this was Tao Li's most superb performance, Tao Li could always surprise him and slap him in the face mercilessly!

The key is that he doesn't have a temper in this face, and even has a little perverted pleasure...... (Whip Candle Bowling Waiting)

There are still more than two minutes before the end of class, and Tao Li is also making a final summary.

"In today's lesson, we mainly learned about the properties of parabola, and also compared the similarities and differences of the three curves in the conic curve. At the same time, let us thank all the leaders and colleagues who came to listen to the lecture with warm applause!"

As soon as Tao Li's words were finished, thunderous applause immediately sounded in the entire lecture hall, and in the applause of the students, the bell for the end of class finally rang.

But no one wanted to leave, and everyone was still immersed in Tao Li's lectures, unable to extricate themselves.