A polygon. A plane is two dimensional, like a coordinate plane or flat drawings on a piece of paper. If you drew three connecting line segments on a piece of paper, you would be left with a triangle. Four lines create a quadrilateral. Five lines could create a pentagon. All of these shapes are examples of polygons.
* * * * *
Yes, but a sector of a circle is also formed from three coplanar segments: two straight line segments and one curved. And it is very definitely NOT a polygon.
IF (and only if) the lines are al coplanar, then a polygon.
triangel
A polygon.
If rays, parallel ones. If segments there are many more options because you can have a segment that is not long enough to reach the point of intersection.
a polygon
IF (and only if) the lines are al coplanar, then a polygon.
polygon
polygon
Polygon and they do not cross.
triangle
A simple closed figure formed by three or more segments is called a polygon. Regardless of how many sides a polygon has, all polygons will have as many vertices as it has sides.
Triangle: A figure formed by exactly three (non-colinear) points joined by line segments is a triangle. A figure formed by three or more points is generally called a polygon. Of course, if all of the points are co-linear then there is not much of a figure. A polygon has 3 or more sides.
polygon
A triangle.
polygon
A irregular is a closed plane figure formed by three or more line segments.
If they are straight lines then it is a polygon.