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  2. An Lushan rebellion - Wikipedia

    en.wikipedia.org/wiki/An_Lushan_rebellion

    The 10 major jiedushi before An Lushan's rebellion. Beginning in 742, Eurasia entered a 13-year period of major political turmoil, with the regional empires generally suffering "a major rebellion, revolution, or dynastic change."

  3. Southern Democrats - Wikipedia

    en.wikipedia.org/wiki/Southern_Democrats

    The Border States or Border South of Kentucky, Maryland, and Missouri of the Upper South were torn by political turmoil. Kentucky and Missouri were both governed by pro-secessionist Southern Democratic Governors who vehemently rejected Lincoln's call for 75,000 troops .

  4. Five Dynasties and Ten Kingdoms period - Wikipedia

    en.wikipedia.org/wiki/Five_Dynasties_and_Ten...

    The Five Dynasties and Ten Kingdoms period (Chinese: 五代十國) was an era of political upheaval and division in Imperial China from 907 to 979. Five dynastic states quickly succeeded one another in the Central Plain, and more than a dozen concurrent dynastic states, collectively known as the Ten Kingdoms, were established elsewhere, mainly in South China.

  5. Solution of triangles - Wikipedia

    en.wikipedia.org/wiki/Solution_of_triangles

    Solution of triangles (Latin: solutio triangulorum) is the main trigonometric problem of finding the characteristics of a triangle (angles and lengths of sides), when some of these are known. The triangle can be located on a plane or on a sphere. Applications requiring triangle solutions include geodesy, astronomy, construction, and navigation.

  6. Revolutions of 1917–1923 - Wikipedia

    en.wikipedia.org/wiki/Revolutions_of_1917–1923

    The revolutions had lasting effects in shaping the future European political landscape, with, for example, the collapse of the German Empire and the dissolution of Austria-Hungary. [3] World War I mobilized millions of troops, reshaped political powers and drove social turmoil. From the turmoil outright revolutions broke out, massive strikes ...

  7. Heronian triangle - Wikipedia

    en.wikipedia.org/wiki/Heronian_triangle

    In geometry, a Heronian triangle (or Heron triangle) is a triangle whose side lengths a, b, and c and area A are all positive integers. [1] [2] Heronian triangles are named after Heron of Alexandria, based on their relation to Heron's formula which Heron demonstrated with the example triangle of sides 13, 14, 15 and area 84.

  8. 2015 Bangladeshi political crisis - Wikipedia

    en.wikipedia.org/wiki/2015_Bangladeshi_political...

    The 2015 Bangladeshi political crisis is an ongoing state of political turmoil between the two main political parties of Bangladesh, the Awami League (AL) led by prime minister Sheikh Hasina who is currently in power, and the Bangladesh Nationalist Party (BNP) in opposition, led by three time former prime minister Khaleda Zia.

  9. Missing square puzzle - Wikipedia

    en.wikipedia.org/wiki/Missing_square_puzzle

    The apparent triangles formed from the figures are 13 units wide and 5 units tall, so it appears that the area should be S = ⁠ 13×5 / 2 ⁠ = 32.5 units. However, the blue triangle has a ratio of 5:2 (=2.5), while the red triangle has the ratio 8:3 (≈2.667), so the apparent combined hypotenuse in each figure is actually bent.