The first is the triangle area formula. Most people know that the area of a triangle is calculated by its base and its high multiplier 1/2. If I tell you this, it's very low. Everyone knows this, and even the children who go to primary school but don't go to school in Lian Gang know this simple formula. That's definitely not what I introduced you to. He only needs to know the lengths of the three sides of the triangle, and he can easily calculate the area of the triangle. Now that you hear this, do you think there is a powerful formula? It's hard for you to pretend to feel your strength in front of your friends. Of course, you can show how powerful you are in front of girls. Let the three sides of a triangle be a b c and 1/2 of the product of abc3 numbers be P, then the area of the triangle can be obtained. The triangle area s is equal to the square root of P times P minus A times P minus B times P minus C, where P is used and the formula is also used. You have to impress others. I don't know why you did it, but I can tell you that this formula is absolutely correct.
Another popular and convenient knowledge is that if you cut a square with a plane, how many faces can you intersect at most? But six faces, because a cube has six faces. He can meet six faces at most. But in the course of your visit, you may stop at three, four, five, or at most six. You can try if you don't believe me, but six interviews can really be done.
The above are the mathematical formulas and tips I gave you today, hoping to help you.