It is a polygon
It is a polygon that is a closed plane figure with 3 or more straight lines.
If none of the sides ever cross each other, there cannot be a closed plane figure.
A quadrilateral.
It is a polygon
A closed plane figure with any number of sides is called a polygon. Polygons can have a variety of shapes and sizes, classified by the number of sides they possess, such as triangles (3 sides), quadrilaterals (4 sides), pentagons (5 sides), and so on. They are two-dimensional shapes that can be regular (with equal sides and angles) or irregular (with varying side lengths and angles). Examples include squares, rectangles, and hexagons.
If they are straight sides, then a polygon. Otherwise, simply "a closed plane figure with 3 or more sides".
It is a polygon that is a closed plane figure with 3 or more straight lines.
A three sided closed plane figure (shape) is a triangle.
If none of the sides ever cross each other, there cannot be a closed plane figure.
A quadrilateral is a closed plane figure with four straight sides.
A quadrilateral.
A polygon
Polygon
A polygon
It is a polygon
Yes
Any closed figure that is not entirely composed of straight sides, such as an ellipse or a circle.