A shape's sides are called faces.
A seven sided shape is called a heptagon or a septagon.......
A one sided shape (ignoring the poor grammar) is a line. Is that what you wanted?
A seven or 7 sided polygon shape is called a Heptagon(hep-ta-gone).
Any plane shape on the side of a polyhedron is called a face.
If each angle is 90 degrees the shape is called a square.
A shape that has 11 sides is called a hendecagon.
icosikaienneagon
A nonagon
An octagon
A nine sided shape is called a nonagon.
a line
Interior angle
icosakaitetragon
A seven sided shape is called a heptagon or a septagon.......
I guess 13 angle shape
An edge.
Its called a Möbius strip