יצירה זו נמצאת בנחלת הכלל במדינת המקור ובמדינות אחרות בהם תקופת זכויות היוצרים היא משך חיי היוצר ו-70 שנה (או פחות) מפטירתו. You must also include a United States public domain tag to indicate why this work is in the public domain in the United States.  Note that a few countries have copyright terms longer than 70 years: Mexico has 100 years, Jamaica has 95 years, Colombia has 80 years, and Guatemala and Samoa have 75 years. This image may not be in the public domain in these countries, which moreover do not implement the rule of the shorter term. Honduras has a general copyright term of 75 years, but it does implement the rule of the shorter term. Copyright may extend on works created by French who died for France in World War II (more information), Russians who served in the Eastern Front of World War II (known as the Great Patriotic War in Russia) and posthumously rehabilitated victims of Soviet repressions (more information).

הקובץ הזה זוהה כקובץ חופשי מכל מגבלה ידועה תחת חוק זכויות היוצרים, כולל כל הזכויות הקשורות והסמוכות.

https://creativecommons.org/publicdomain/mark/1.0/PDMCreative Commons Public Domain Mark 1.0falsefalse

Source: Chinese Pythagorean theorem, from page 22 of Joseph Needham's Science and Civilization in China: Volume 3, Mathematics and the Sciences of the Heavens and the Earth, published in 1986 by Cave Books Ltd., based in Taipei (with permission from Cambridge University Press). isbn:0521058015

Visual proof for the (3, 4, 5) triangle as in the Chou Pei Suan Ching 500–200 BC.
Left sentence: 勾股幂合以成弦幂 (gōu gǔ mì hé yǐ chéng xián mì)
Translation: The sum of the squares of lengths of altitude and base is the hypotenuse's length squared.

Derivative works of this file:  Chineese Pythagorean theorem 2.PNG