What is the basis for the nature of vertex angle

When the vertex angle is equal, it is based on the complementary and equivalent substitution of the two corners

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1. The properties of vertex angle are as follows______ ．
2. The property theorem of vertex angle is
3. Observe the difference and look for the right vertex angle, When there are two lines intersecting at a point, there are () pairs of vertex angles. When there are three lines, there are () pairs of vertex angles. When there are four lines, there are () pairs of vertex angles. When there are n lines, there are () pairs of vertex angles
4. What is opposite vertex angle
5. Observe the following figures to find the opposite vertex angle (excluding horizontal angle) (1) As shown in figure a, there are & nbsp; & nbsp; pairs of vertex angles in the figure; (2) As shown in Figure B, there are & nbsp; & nbsp; pairs of vertex angles in the figure; (3) As shown in Figure C, there are & nbsp; & nbsp; pairs of vertex angles in the figure; (4) This paper studies the relationship between the number of straight lines and the logarithm of opposite vertex angle in (1) ～ (3). If n straight lines intersect at a point, how many pairs of opposite vertex angle can be formed? (5) If there are 2008 lines intersecting at a point, how many pairs of vertex angles can be formed?
6. If two angles are equal, then they are opposite vertex angles
7. Two equal angles are opposite vertex angles. Is that right also: The sum of adjacent complementary angles is 180 degrees, The remaining angles of the two angles are equal, Two complementary angles are also called adjacent complementary angles, also What is the angle formed by the bisector of two adjacent complementary angles?
8. Unequal angles are not opposite to vertex angles Is this proposition true? Give reasons
9. A ^ 2-1 of A-2 divided by (a-1-a + 1 of 2a-1), where a is the root of the equation x ^ 2-x = root 3
10. Given the function f (x) = | x2-2 |, if f (a) ≥ f (b), and 0 ≤ a ≤ B, then the area bounded by the points (a, b) satisfying the condition is___ ．
11. Definition and properties of vertex angle
12. What is the meaning of vertex angle
13. Definition of vertex angle
14. Are the opposite vertex angles equal or are the two opposite vertex angles equal
15. If the two angles are opposite vertex angles, then_________________
16. If two angles are opposite vertex angles and complementary, then the degrees of the two angles are______ ．
17. Two complementary angles cannot be opposite vertex angles
18. If two pairs of vertex angles complement each other, the two lines forming the two angles are perpendicular to each other
19. A. The equal angle is the opposite vertex angle B. the shortest line between two points C. two lines are cut by the third line, and the internal stagger angles are equal D. in the same plane, parallel to Which proposition is correct when two lines of the same line are parallel
20. It is known that the complementary angle of angle A and the opposite vertex angle of angle B complement each other. When a = 40 degrees, angle B =?