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Why is a 5 sided shape called a pentagon?
A 5 sided shape is called a pentagon because Geometry was studied (and practically invented) by the Greeks. The word pentagon is made up of two Greek words: πέντε γωνία which are: πέντε (or pente) the Greek for 5 γωνία (or gonia) the Greek for Corner or Angle. Thus the word "Pentagon" literally means "five angles", so a pentagon is a shape with five angles. Having five angles it also has five sides. All two dimensional shapes are called polygons; this too comes from two Greek words: πολλοί (polloi) meaning Many (transliterated into English as "poly") γωνία (gonia) meaning Angle (as before). Thus a "Polygon" is literally a "many angled" shape.
What is a two dimensional object in geometry?
Two dimensional geometry is called "plane geometry" meaning that it occurs on a single surface or plane. The objects used in plane geometry are called plane figures.
What is plain geometry?
Presumably it is simply geometry. However, plane geometry is geometry which is limited to objects with up to two dimensions, that is, objects that lie in a plane - or on a flat surface.
What has two dimensions in geometry?
a plane
What are the two kinds of geometry?
euclidean Geometry where the parallel line postulate exists. and the is also eliptic geometry where the parallel line postulate does not exist.
