There is no specific name.
A sphere
I do not know but: A closed figure is a figure with sides all around. (if the sides were fences and you were on the inside you could not get out witout climbing a fence)
No. It is close with four sides and four interior angles each 90 degrees.
Look for the two sides which are parallel. You will find the mid segment halfway between the two sides.
There is no specific name.
A sphere
I do not know but: A closed figure is a figure with sides all around. (if the sides were fences and you were on the inside you could not get out witout climbing a fence)
polygon
Well a triangle has 3 sides and vertices.
A square...?
no, but an eight sided figure you could use is an octagon. a figure 8 may be a figure and closed but, it has no sides and no line segments.
a polygon
A heptagon is a 2-dimentional closed figure with seven sides, each side being a line segment
A simple polygon is a closed, straight-sided figure in which the sides do not overlap.
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.
It is a 'many sided' polygon