A polygon
It is a seven-sided polygon
polyhedron
It looks like a circle
A chevron. Basically, any polygon with an acute angle whose vertex points to the center of the shape.
A polygon
Like this
the polygon would be a square
A polygon is a plane figure that is closed with straight line segments.
it look like a fifty sided shape
It is a seven-sided polygon
polyhedron
Polygon
The Pentagon.
a triangle.
It is a quadrilateral.
Since there is no need for it to be a regular polygon, it will look like a closed loop.