A shape with 100 sides is called a hecatontagon. The prefix "hecto-" means 100 in Greek, so a hecatontagon is a polygon with 100 sides. It is a regular polygon, meaning all its sides are of equal length and all its angles are equal.
Hectogon, although most mathematicians would call it a "100-gon."
A shape with 7 sides is a heptagon
you call a two dimensional shape with six sides a hexagon
A shape with 8 sides is an octagon.
Triangle is a shape with three sides.
A regular shape.
quinterron
a shape with 100 sides
a shape with nine sides is called nonagon
It is an irregular shape
A shape with straight sides is called a polygon. But it can have 3 or 4 sides as well.
A shape with 5 sides is a pentagon