An angel investor or angel (also known as a business angel or informal investor) is an affluent individual who provides money for a business start-up, usually in exchange for ownership equity. A small but increasing number of angel investors organize themselves into angel groups or angel networks to share research and pool their investment capital. Angels typically invest their own funs. Angel investing deals with money, which deals with numbers, which deals with math, because in math, you use numbers. That is how angels are mixed in with math. :)
A tessellation is created when a shape is repeated over and over again covering a plane without any gaps or overlaps. Another word for tessellation is a tiling. The dictionary says that the word "tessellate" means to form or arrange small squares in a checkered or Mosaic pattern. The word "tessellate" comes from the Ionic version of the Greek word "tesseres," which in English means "four." The first tilings were made from square tiles. A regular polygon has 3 or 4 or 5 or more sides and angles, all equal. A regular tessellation means a tessellation made up of congruent regular polygons.
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