Planes along with points and lines form the building blocks of Geometry. These are named as undefined terms as they are explained only using examples and descriptions and not with definitions. In algebra you are familiar with the coordinate plane on which points are plotted using ordered pairs and lines are represented as equations. Thus, a plane can be described as a flat surface made up of infinitely many points extending in all directions without thickness..
A plane can be represented by a capital letter like Plane X. It can also be represented using at least three non collinear points that lie on the plane, like plane ABC.
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