Plane-geometry
noun, Mathematics.
1.
the geometry of figures whose parts all lie in one plane.
noun
1.
the study of the properties of and relationships between plane curves, figures, etc
plane geometry
The mathematical study of geometric figures whose parts lie in the same plane, such as polygons, circles, and lines.
The study of two-dimensional figures (figures that are confined to a plane).
Note: Plane geometry is one of the oldest branches of mathematics.
Note: The Greek mathematician Euclid was the first to study plane geometry carefully. His book Elements was the standard plane geometry textbook for centuries.
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