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  2. 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.

  3. Envision Schools - Wikipedia

    en.wikipedia.org/wiki/Envision_Schools

    Envision Academy of Arts & Technology in Oakland, California, opened in 2007-08 school year with students in grades 9 and 10; today, it serves students in grades 6-7 and 9-12. It will add 8th grade in school year 2021-22. Impact Academy of Arts & Technology in Hayward, California, opened for 2007-08 with 125 students in grade 9. [6]

  4. McGraw Hill Education - Wikipedia

    en.wikipedia.org/wiki/McGraw_Hill_Education

    McGraw-Hill logo used from 1971 to the late 1990s 330 West 42nd Street, the former, long-time headquarters of McGraw Hill. McGraw Hill was founded in 1888, when James H. McGraw, co-founder of McGraw Hill, purchased the American Journal of Railway Appliances.

  5. Mathematics - Wikipedia

    en.wikipedia.org/wiki/Mathematics

    This principle, foundational for all mathematics, was first elaborated for geometry, and was systematized by Euclid around 300 BC in his book Elements. [ 21 ] [ 22 ] The resulting Euclidean geometry is the study of shapes and their arrangements constructed from lines, planes and circles in the Euclidean plane ( plane geometry ) and the three ...

  6. Five color theorem - Wikipedia

    en.wikipedia.org/wiki/Five_color_theorem

    The five color theorem is a result from graph theory that given a plane separated into regions, such as a political map of the countries of the world, the regions may be colored using no more than five colors in such a way that no two adjacent regions receive the same color.

  7. Philippines - Wikipedia

    en.wikipedia.org/wiki/Philippines

    The Philippines, [f] officially the Republic of the Philippines, [g] is an archipelagic country in Southeast Asia.In the western Pacific Ocean, it consists of 7,641 islands, with a total area of roughly 300,000 square kilometers, which are broadly categorized in three main geographical divisions from north to south: Luzon, Visayas, and Mindanao.