# Pythagorean theorem

### noun Geometry.

the theorem that the square of the hypotenuse of a right triangle is equal to the sum of the squares of the other two sides.

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## Origin of Pythagorean theorem

First recorded in 1905–10

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Based on the Random House Unabridged Dictionary, © Random House, Inc. 2019

## Pythagorean theorem

[pĭ-thăg′ə-rē′ən]

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

## Pythagorean theorem

[(puh-thag-uh-ree-uhn, peye-thag-uh-ree-uhn)]

## Note

The theorem is often expressed a2 + b2 = c2.

## Note

The simplest whole number expression of this theorem is called the 3, 4, 5 triangle. In a right triangle, if one side measures three units, and the second side measures four units, the hypotenuse must measure five units because 32 + 42 = 52; that is, 9 + 16 = 25.

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.