plane geometry

noun

, Mathematics.

1. the geometry of figures whose parts all lie in one plane.

plane geometry

noun

1. the study of the properties of and relationships between plane curves, figures, etc

plane geometry

1. The mathematical study of geometric figures whose parts lie in the same plane, such as polygons, circles, and lines.

plane geometry

1. The study of two-dimensional figures (figures that are confined to a plane ).

Notes

Plane geometry is one of the oldest branches of mathematics .

The Greek mathematician Euclid was the first to study plane geometry carefully. His book Elements was the standard plane geometry textbook for centuries.

Word History and Origins

Origin of plane geometry¹

First recorded in 1740–50

Example Sentences

“What do you know about imaginary numbers, plane geometry, and vector algebra, Jake?”

From Literature

He learned in part by drawing biology and plane geometry projects and whatever else the teachers asked for.

From New York Times

But in the eleventh grade, I got good scores in plane geometry from the start.

From Literature

The treatise contains 13 separate books, covering everything from plane geometry, the Pythagorean theorem, golden ratio, prime numbers, and quite a bit more.

From The Verge

In 1952, my plane geometry book was a tattered volume first used by white students in 1935, the year I was born.

From New York Times