What is the meaning of vertex angle

Vertical angles: both sides of an angle are opposite extension lines of the other angle. These two angles are opposite vertex angles. After two lines intersect, there is only one common vertex and both sides of the two angles are opposite extension lines. Such two angles are called opposite vertex angles, Two pairs of opposite vertex angles are formed. The two opposite vertex angles are equal to each other (the property of opposite vertex angle). Opposite vertex angle is the name of two angles with special position. Equal opposite vertex angle reflects the size relationship between two angles

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1. Definition and properties of vertex angle
2. What is the basis for the nature of vertex angle
3. The properties of vertex angle are as follows______ ．
4. The property theorem of vertex angle is
5. 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
6. What is opposite vertex angle
7. 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?
8. If two angles are equal, then they are opposite vertex angles
9. 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?
10. Unequal angles are not opposite to vertex angles Is this proposition true? Give reasons
11. Definition of vertex angle
12. Are the opposite vertex angles equal or are the two opposite vertex angles equal
13. If the two angles are opposite vertex angles, then_________________
14. If two angles are opposite vertex angles and complementary, then the degrees of the two angles are______ ．
15. Two complementary angles cannot be opposite vertex angles
16. If two pairs of vertex angles complement each other, the two lines forming the two angles are perpendicular to each other
17. 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
18. 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 =?
19. The following statement is correct: A. from the fact that the opposite vertex angles are equal, we can get that the equal angles are opposite vertex angles. B. two equal angles with common vertex are opposite vertex angles C. Two complementary angles with common vertices are adjacent complementary angles D. If two angles are opposite vertex angles, they must be equal
20. When three straight lines intersect at the same point, there are M pairs of vertex angles; when three straight lines intersect at different points, there are n pairs of vertex angles, then the relationship between M and N is () A. m=nB. m＞nC. m＜nD. m+n=10