What do you call a polygon that has 100000000000000 sides?

Answer 1

A polygon with 100,000,000,000,000 sides is called a "hectogon" or "100-trigintillion-gon," though such names are rarely used in practice. In general, polygons are often referred to using the prefix that denotes their number of sides, so it could be informally called a "100 trillion-gon." However, due to the impracticality of visualizing or working with such a shape, these terms are mostly theoretical.

Answer 2

A polygon with 100,000,000,000,000 sides is called a "henagon," though it is more commonly referred to as a "megagon" or "myriagon" depending on the context. In general, such a polygon can be named using the Greek prefix for the number of sides, so it would be a "100 trillion-gon." However, due to the vast number of sides, it would be nearly indistinguishable from a circle in practical terms.