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# Pythagorean theorem

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noun Geometry.
1. 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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First recorded in 1905–10
Dictionary.com Unabridged Based on the Random House Unabridged Dictionary, © Random House, Inc. 2018
pythagorean theorem in Science

# Pythagorean theorem

[pĭ-thăg′ə-rēən]
1. A theorem stating that the square of the length of the hypotenuse of a right triangle is equal to the sum of the squares of the lengths of the other sides. It is mathematically stated as c2 = a2 + b2, where c is the length of the hypotenuse and a and b the lengths of the other two sides.

pythagorean theorem in Culture

# Pythagorean theorem

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

The theorem in geometry that, in a triangle with one right angle, usually called a right triangle, the square of the length of the hypotenuse is equal to the sum of the squares of the lengths of the other two sides.

## 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.