Killigon
There is no such thing as a 1 sided shape nor a two sided shape.
100 Millinillion pennies. That's a 1 followed by 3005 zeros.
a 2 sided shape is real but a 1 sided shape is not
a circle
Yes a monogon
Pintigon
Dekingon
Hipintigon
a Hecatommyriagon
line
polygon
a pentagon