The three undefined terms of geometry are:
- Point : A point represents a location in space and has no size, dimension, length, width, or thickness. It is simply a position and is usually represented by a dot labeled with a capital letter.
- Line : A line is an infinite set of points extending in two opposite directions without thickness or width. It has one dimension (length) and is often represented by a straight line with arrowheads on both ends.
- Plane : A plane is a flat surface that extends infinitely in two dimensions (length and width) but has no thickness. It can be visualized as an endless flat sheet.
These terms are called "undefined" because they are the fundamental building blocks of geometry and are not formally defined using other terms; instead, they are described intuitively and used to define other geometric concepts and theorems
