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# plane geometry

## noun

,

*Mathematics.*- the geometry of figures whose parts all lie in one plane.

plane geometry

## noun

- 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.

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## 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.Discover More

## Word History and Origins

Origin of plane geometry^{1}

First recorded in 1740–50

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## Example Sentences

In plane geometry, reckoning the line as a curve of the first order, we have only the point and the curve.

From Project Gutenberg

Euclidean interpretation of hyperbolic plane geometry, his results will be stated at some length14.

From Project Gutenberg

She was a quiet girl who was designed like a tall problem in plane geometry.

From Project Gutenberg

The figure suggests the case of two circles in plane geometry.

From Project Gutenberg

Not until 1844 did Harvard require any plane geometry for entrance.

From Project Gutenberg

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