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  2. Ancient Egypt - Wikipedia

    en.wikipedia.org/wiki/Ancient_Egypt

    They were aware, for example, that a triangle had a right angle opposite the hypotenuse when its sides were in a 3–45 ratio. [196] They were able to estimate the area of a circle by subtracting one-ninth from its diameter and squaring the result: Area ≈ [(8 ⁄ 9)D] 2 = (256 ⁄ 81)r 2 ≈ 3.16r 2, a reasonable approximation of the ...

  3. Human history - Wikipedia

    en.wikipedia.org/wiki/Human_history

    Human history is the record of humankind from prehistory to the present. Modern humans evolved in Africa around 300,000 years ago and initially lived as hunter-gatherers . They migrated out of Africa during the Last Ice Age and had populated most of the Earth by the end of the Ice Age 12,000 years ago.

  4. Quizlet - Wikipedia

    en.wikipedia.org/wiki/Quizlet

    Quizlet is a multi-national American company that provides tools for studying and learning. [1] Quizlet was founded in October 2005 by Andrew Sutherland, who at the time was a 15-year old student, [2] and released to the public in January 2007. [3] Quizlet's primary products include digital flash cards, matching games, practice electronic ...

  5. History of Southern Africa - Wikipedia

    en.wikipedia.org/wiki/History_of_Southern_Africa

    The history of Southern Africa has been divided into its prehistory, its ancient history, the major polities flourishing, the colonial period, and the post-colonial period, in which the current nations were formed. Southern Africa is bordered by Central Africa, East Africa, the Atlantic Ocean, the Indian Ocean, and the Sahara Desert.

  6. History of Africa - Wikipedia

    en.wikipedia.org/wiki/History_of_Africa

    History of Africa. Archaic humans emerged out of Africa between 0.5 and 1.8 million years ago. This was followed by the emergence of modern humans (Homo sapiens) in East Africa around 300,000–250,000 years ago. In the 4th millenium BC written history arose in Ancient Egypt, [1] and later in Nubia 's Kush, the Horn of Africa 's Dʿmt, and ...

  7. Middle Ages - Wikipedia

    en.wikipedia.org/wiki/Middle_Ages

    Middle Ages. In the history of Europe, the Middle Ages or medieval period (also spelt mediaeval or mediæval) lasted from approximately 500 to 1500 AD. It is the second of the three traditional divisions of Western history: antiquity, medieval, and modern. Major developments include the economic predominance of agriculture, exploitation of the ...

  8. History of the Philippines - Wikipedia

    en.wikipedia.org/wiki/History_of_the_Philippines

    The history of the Philippines dates from the earliest hominin activity in the archipelago at least by 709,000 years ago. [1] Homo luzonensis, a species of archaic humans, was present on the island of Luzon [2] [3] at least by 134,000 years ago. [4] The earliest known anatomically modern human was from Tabon Caves in Palawan dating about 47,000 ...

  9. History of science - Wikipedia

    en.wikipedia.org/wiki/History_of_science

    The history of science covers the development of science from ancient times to the present. It encompasses all three major branches of science: natural, social, and formal. [1] Protoscience, early sciences, and natural philosophies such as alchemy and astrology during the Bronze Age, Iron Age, classical antiquity, and the Middle Ages declined ...

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