Plane Geometry deals with geometrical entities of dimensions two and less. A Plane along with a point and line is an undefined term in Geometry, its meaning is accepted without a definition. Its meaning is similar to the coordinate plane in Algebra.
Plane Geometry is the subject that deals with axioms, theorems and problems related to Points, Straight lines and two dimensional shapes like Polygons, circles and other plane curves.Greek Mathematician Euclids's book on Geometry "Elements" form the basis for the study of Plane Geometry. Let us now look briefly how the problems are approached and solved in Plane Geometry.

Plane Geometry is the study of entities that a two dimensional space can hold. Systematic reasoning is applied using definitions, Postulates, and theorems to solve problems.