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

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

From Time Magazine Archive

Flora High School, for example, is doing away with separate plane geometry sections, now groups 230 students in one large classroom with half a dozen TV sets suspended from the ceiling.

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

“It’s just a very challenging plane geometry problem. How do we find ‘X’ without knowing ‘A’? I may need to ask an expert for help.”

From "The Smartest Kid in the Universe" by Chris Grabenstein