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

Not only did Dr. Fawcett's pupils rate high er than other high-school youngsters in tests on reasoning ability, but they got the best marks in the State in plane geometry.

From Time Magazine Archive

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

From Time Magazine Archive

Instead of the old prep-school curriculum of two years of algebra, one of plane geometry, and one of either trigonometry or solid geometry, schools should place more stress on broad mathematical principles.

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