Law of logarithm: straight lines intersect at one point, two intersect, there are two pairs of logarithm of vertex angle, and six pairs of logarithm of adjacent complementary angle Straight lines intersect at one point and two intersect. There are two pairs of logarithms of vertex angles and six pairs of logarithms of adjacent complementary angles And so on, how many pairs of vertex angles do n lines intersect

2n (2n-3) group. N lines intersect at a point, resulting in a total of 2n small angles. Each small angle and other adjacent small angles (two or three or more small angles) can produce (2n-3) angles less than 180 degrees (including the small angle itself). Each such angle less than 180 degrees is complementary to the other angle. There are a total of 2n small angles. So that's the answer
You can take two or three straight lines

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1. The logarithm of the vertex angle formed by the intersection of three different lines on the plane is
2. The three straight lines intersect each other to form a logarithmic relation to the vertex angle
3. 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
4. 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
5. 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
6. 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
7. 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 =?
8. 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
9. If two pairs of vertex angles complement each other, the two lines forming the two angles are perpendicular to each other
10. Two complementary angles cannot be opposite vertex angles
11. (1, 2, 3, 4. N) how many logarithms of vertex angle are there when the lines intersect at a point? What is the law? Online, etc
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