plane geometry

American  

noun

Mathematics.

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

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plane geometry British  

noun

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

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plane geometry Scientific  

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

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plane geometry Cultural  

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

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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.

Etymology

Origin of plane geometry

First recorded in 1740–50

Example Sentences

But their boxes, X-shapes and intersecting lines are as eternal as plane geometry.

From Washington Post • Jul. 2, 2015

By high-school plane geometry, the second circle will have four times the area of the first one.

From Time Magazine Archive

I have moved through arithmetic, through plane geometry and algebra, and now I am in calculus.

From Time Magazine Archive

Those who break into a sweat at the mention of calculus or plane geometry can relax.

From Time Magazine Archive

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

From "October Sky" by Homer Hickam