What is a polygon row and what is a polygon

In mathematical terms, a closed figure consisting of three or more line segments connected sequentially is called a polygon. According to different standards, polygons can be divided into regular and non-regular polygons, convex polygons and concave polygons.

A closed shape consisting of three or more line segments connected in order at the first end is called a polygon.

A closed graphic consisting of three or more line segments connected sequentially in the first place.

A graph that contains more than 3 edges.

It's a graph with a lot of edges.

multiple edges and to form an enclosed shape.

A flat graphic consisting of three or more line segments connected one after the other.

It's just not catwalking when walking.

Polygon: A closed shape consisting of three or more line segments connected end-to-end.

PS: Triangles are also polygons.

Hope it helps

No need for mathematical terms, in the words of ordinary people: a polygon is a figure with three or more line segments connected one after the other, and two points of a line segment can only be connected to another line segment at one time.

To put it simply, it is a closed figure composed of three or more line segments connected sequentially at the first time, one is a line

A graph consisting of more than 4 straight lines connected one after the other.

A closed figure formed by four or more straight lines connected end-to-end.

The first connected figure greater than 3 is the opposite side row.

A polygon is a figure with a number of sides greater than or equal to 3...

A closed, non-intersecting figure consisting of three or more straight lines.

A closed figure consisting of three or more line segments on the same plane and not on the same line that are connected one after the other and do not intersect is called a polygon. A figure composed of multiple line segments on different planes that are connected sequentially and do not intersect is also called a polygon, which is a polygon in a generalized sense. There are at least 3 line segments that make up a polygon, with triangles being the simplest polygons.

Each line segment that makes up a polygon is called an edge of the polygon; The common endpoints of two adjacent line segments are called the vertices of the polygon; The angles formed by the adjacent sides of the polygon are called the inner angles of the polygon; The line segment that connects two non-adjacent vertices of a polygon is called the diagonal of the polygon. Polygons can also be divided into regular polygons and non-regular polygons. The regular polygon has equal sides and equal interior angles.

Polygons can also be divided into convex polygons and concave polygons, convex polygons can also be called plane polygons, concave polygons are also called space polygons (this theorem only applies to convex polygons, that is, plane polygons, spatial multilaterality does not apply) Generalized polygons also include figures such as pentagrams. A limited number of points A1, A2, A3 、..., an-1, an, and line segments a1a2, a2a3, 、..., an-1an, is called a polyline. A1 and an are called polygons.

Make the end of this polyline; a2、a3、…, an-1 is called the vertex of the polyline; a1a2、a2a3、…, an-1an is called the segment of the polyline. If the endpoints of the polyline and the vertices are not in the same plane, it is called a spatial polyline; If each vertex and both endpoints are in the same plane, it is called a planar polyline. A polyline with two ends that coincide is called a polygon.

Polygons made up of spatial polylines are called spatial polygons; Polygons that are made up of planar polylines are called planar polygons. If the polyline a1a2a3....The two endpoints of an-1an a1 and an coincide to form the polygon a1a2a3....an-1an；a1a2、a2a3、 …an-1an is called the edge of a polygon; ∠ana1a2、∠a1a2a3、…The corners are called polygons; a1、a2、a3、…, an-1, and an are called the vertices of this polygon. Plane polygons are classified according to the number of sides, which can be divided into trilateral (corner) shapes, quadrilaterals, pentagons, hexagons, and so on.

The sum of the inner angles of the polygon and the theorem of the inner angles of the n-sided is equal to: (n

2) 180°, then the number of internal angles of the regular polygon is: (n

2）×180°÷n。

A convex polygon is a convex polygon if any one of the sides of a polygon is infinitely extended to two sides to become a straight line, and the other sides are on the same side of the line.

The inner angles of the convex polygon are all less than 180°, the sum of the inner angles of the convex polygon with the number of sides is (n2) 180°, the sum of the outer angles is 360°, and the number of acute angles in the inner corners of the convex polygon cannot be more than 3.

All diagonals of a convex polygon are inside, and the number of diagonal lines of a convex polygon with the number of sides n is n(n-3) 2, where any vertex can be connected with the remaining n 3 vertices.

The lines of any two points in a polygon are all inside or on the edges of the polygon.

All regular polygons are convex polygons.

All triangles are convex polygons.

It's that every edge is equal and every angle is the same, and it's called a regular polygon.

From one of the vertices of the n-side, (n-3) diagonals can be derived.

There are two diagonals of n(n-3) in an n-sided polygon.

n-3) is because the n-sided has n edges, starting from a vertex, except for its own vertex and the two vertices adjacent to itself can not be connected diagonal, a total of three lines, so subtract 3 to (n-3).

n(n-3) 2 is due to the fact that (n-3) diagonals can be drawn from a vertex, and n-sides have n sides, so it is n(n-3), but exactly half of them are repeated, so divide by 2 to become n(n-3) 2.

How many diagonals are there?

From one vertex you can make n-3 diagonals, (because it cannot be connected to oneself, two adjacent ones).

There are n vertices, so there are n(n-3) diagonals.

But each diagonal is repeated once (AB departs from both A and B), and then divides by 2

The formula is obtained.

n(n-3)/2