A Hecatommyriagon has one million sides. Also megagon. See Sources and related links for more.
a shape with one million sides
There is no "most" with respect to polygons. You could make a shape with a million sides, and then make a new shape with a million and one, and keep going forever.
A shape very close to a circle or an oval.
actually circles have one side... no shape exists, that has no sides
A shape with no sides next to each other would be a one sided shape, ie, a circle.
a shape with one million sides
There is no "most" with respect to polygons. You could make a shape with a million sides, and then make a new shape with a million and one, and keep going forever.
A one-million-sided polygon.
A shape with a million sides.
a 1,000,000-gon, or a megagon
what is a shape that have 8 sides
There is no specific name for such a shape.
A shape very close to a circle or an oval.
actually circles have one side... no shape exists, that has no sides
A shape with no sides next to each other would be a one sided shape, ie, a circle.
trapezium
Trapezoid