# plane geometry

### noun Mathematics.

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

## Origin of plane geometry

First recorded in 1740–50

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## plane geometry

### noun

Collins English Dictionary - Complete & Unabridged 2012 Digital Edition
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## plane geometry

The American Heritage® Science Dictionary
Copyright © 2011. Published by Houghton Mifflin Harcourt Publishing Company. All rights reserved.

## plane geometry

## Note

Plane geometry is one of the oldest branches of mathematics.

## Note

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

The New Dictionary of Cultural Literacy, Third Edition
Copyright © 2005 by Houghton Mifflin Harcourt Publishing Company. Published by Houghton Mifflin Harcourt Publishing Company. All rights reserved.