Volumes and areas, polygons, parabolas, etc.
Yes. Superstition is not included in maths.
Drawing straight lines must be a step that is included!
It is a term used with reference to polygons. It means that all sides of the polygon are equal.
A net is an arrangement of polygons, joined edge-to-edge, that when folded up, form the surface of a polyhedron.
But it is because an 11 sided polgon is called an undecagon
yes it is
It started off as a study of the properties of angles and sides of a trigon or triangle but has since broadened into the study of angles and sides of all polygons.
It they weren't equal is wouldn't make a tessellation.
There are lots of different types of polygons Polygons are classified into various types based on the number of sides and measures of the angles.: Regular Polygons Irregular Polygons Concave Polygons Convex Polygons Trigons Quadrilateral Polygons Pentagon Polygons Hexagon Polygons Equilateral Polygons Equiangular Polygons
There are 20.5 + 6 + 9 = 20 (Neither circles nor unclosed linear shapes are polygons.)
I am no sure what you mean by shape, but there are infinitely many different regular polygons, one for every positive integer, so I would think there must be infinitely many shapes.