A shape's sides are called faces.
A seven sided shape is called a heptagon or a septagon.......
"700-sided shape" or perhaps better "700-sided polygon" is just fine. Inventing fancy name for lots of sides doesn't serve any useful purpose.
It's called a side or edge.
A one sided shape (ignoring the poor grammar) is a line. Is that what you wanted?
A shape's sides are called faces.
A shape that has 11 sides is called a hendecagon.
An octagon
icosikaienneagon
A nonagon
A nine sided shape is called a nonagon.
a line
icosakaitetragon
Interior angle
I guess 13 angle shape
A seven sided shape is called a heptagon or a septagon.......
An edge.