It is proved that the intersection line of two planes is perpendicular to the plane formed by the normal vectors of two planes

2. Two normal vectors belong to the plane formed by two normal vectors. 3. The line perpendicular to two intersecting lines is perpendicular to the plane of two lines

RELATED INFORMATIONS

1. What does vector multiplication equal to 1 mean?
2. What's the difference between the scalar product of a vector and the multiplication of two vectors? Generally speaking, what do two vectors OA · ob represent? For example, why is the multiplication of two vectors in the first question not equal to | OA · | ob | cos Sita?
3. What's the meaning of space vector multiplication? Why do two vectors multiplication give coordinates in the question? How to use coordinates?
4. What happens when two vectors that are not in the same plane are added or multiplied? (solid space)
5. What is the geometric meaning of the dot product of two vectors greater than zero?
6. Why is the "product of vectors" the multiplication of modules of two vectors and then the multiplication of cos? Is this artificial? Or is there any basis?
7. Why does vector multiplication have negative numbers? This is a problem of coordinate multiplication Isn't vector multiplication length? How can there be negative numbers?
8. Is the coordinate point multiplication of vector the corresponding coordinate multiplication
9. What is the result of multiplication of vector coordinates? How did it become a number?
10. How to express the multiplication of two coordinate vectors?
11. Are the normal vectors of two planes perpendicular to each other and parallel to each other?
12. On vector and scalar Why are velocity and acceleration vectors? They don't use parallelogram rule when they are calculated, And they can also be compared in size How to distinguish between vector and scalar?
13. If the vector field F (m) is the gradient of a certain scalar function f (m), then it is called a potential function of F (m) f (m), and f (m) is called a potential field
14. Does the negative gradient direction refer to the opposite direction of the gradient direction? If it is a binary function, after the gradient is calculated, will it directly add a negative sign to the formed vector?
15. Is the gradient direction of a binary function unique at a point, or is there countless? Is it the normal direction of the point on the isoline?
16. What is gradient (e.g. vector gradient, concentration gradient, horizontal pressure gradient, force)? Mathematics (vector gradient), physics (concentration gradient), geography (horizontal pressure gradient) and so on are all involved. But what exactly does gradient mean?
17. Math, thank you There is a pile of books for 25 children. No one scores 9 books on average. Some children come here and re score them. Each one scores 5 books on average. How many children come here~~~~ Thank you. Come on, thank you
18. During the promotion period of a certain market, it is stipulated that all goods in the market are sold at 80% of the price. At the same time, when customers consume a certain amount of money in the market, the following plan should be adopted The range of consumption amount x (yuan) 200 ≤ a
19. The example of quadratic function in grade nine mathematics?
20. There is a cylinder with a height of 10 cm. If you subtract 2 cm from its height, the surface area of the cylinder will be reduced by 12.56 square cm. What is the side area of the original cylinder? What is the volume of the original cylinder?