It is two line segmetns meeting at a point and making an angle which can be a straight angle.
Polygon: A closed shape bounded by straight lines.
Any Closed shape have a meeting point
If the shape has three straight lines and no other lines then it has to be a triangle
A shape with 4 straight lines in which there are 2 parallel and 2 unparallel lines is called a Trapezium.
It is a plane shape, ie it is 2-dimensional or flat. It is a closed shape defined by four straight lines that meet at four points, two lines at each point.
A shape made up of line segments is a shape with straight lines, or a polygon. for example, a square has straight lines, or is made up of line segments. A circle is not in that category because it has no straight lines, they are curved.
Two straight lines connected by one curve is the basic horse-shoe shape.
Not really, but if you have many lines it can look like a curved shape.
A quadrilateral or quadrangle.