polygon
They're called lines.
a circle
A line segment
An angle
polygon
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.
A shape with 4 straight lines in which there are 2 parallel and 2 unparallel lines is called a Trapezium.
They're called lines.
a circle
A curvilinear pattern is a curvilinear shape ( a shape made completely of curved lines. no straight lines/edges) repeated across a plane.
Connect five lines together
A line segment
What is the surface included within a set of lines called?
I reckon, if a 70 sided shape is called a heptacontagon, and a 50 sided shape is called a pentacontagon, then a 40 sided shape might be called a quadracontagon, or something along those lines.
An angle
It is called a parallelogram. or a square........ or a rectangle.........