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  2. Acute and obtuse triangles - Wikipedia

    en.wikipedia.org/wiki/Acute_and_obtuse_triangles

    In the case of an acute triangle, all three of these segments lie entirely in the triangle's interior, and so they intersect in the interior. But for an obtuse triangle, the altitudes from the two acute angles intersect only the extensions of the opposite sides. These altitudes fall entirely outside the triangle, resulting in their intersection ...

  3. Heaven and Hell (essay) - Wikipedia

    en.wikipedia.org/wiki/Heaven_and_Hell_(essay)

    Heaven and Hell is a philosophical essay by Aldous Huxley published in 1956. Huxley derived the title from William Blake's book The Marriage of Heaven and Hell. The essay discusses the relationship between bright, colorful objects, geometric designs, psychoactives, art, and profound experience. Heaven and Hell metaphorically refer to what ...

  4. Lambert quadrilateral - Wikipedia

    en.wikipedia.org/wiki/Lambert_quadrilateral

    In geometry, a Lambert quadrilateral (also known as Ibn al-Haytham–Lambert quadrilateral), [1] [2] is a quadrilateral in which three of its angles are right angles. Historically, the fourth angle of a Lambert quadrilateral was of considerable interest since if it could be shown to be a right angle, then the Euclidean parallel postulate could ...

  5. Allegory of the long spoons - Wikipedia

    en.wikipedia.org/wiki/Allegory_of_the_long_spoons

    The long spoons allegory has become part of the folklore of several cultures, for example: Jewish, [3] Hindu, [4] Buddhist, [5] "Oriental" (Middle-Eastern) [6] and Christian. [ 2 ] [ 7 ] In medieval Europe, the food in the story is a bowl of stew; in China, it is a bowl of rice being eaten with long chopsticks.

  6. Heaven and Hell - Wikipedia

    en.wikipedia.org/wiki/Heaven_and_Hell

    Heaven & Hell (Joe Jackson album) Heaven & Hell (Meat Loaf and Bonnie Tyler album) Heaven & Hell (Shin Terai album) Heaven and Hell (Systems in Blue album), or the title song (see below) Heaven and Hell (Vangelis album), or the title song; Heaven :x: Hell, a 2024 album by Sum 41; Heaven & Hell – A Tribute to The Velvet Underground, a series ...

  7. Four last things - Wikipedia

    en.wikipedia.org/wiki/Four_last_things

    Hieronymus Bosch's 1500 painting The Seven Deadly Sins and the Four Last Things.The four outer discs depict (clockwise from top left) Death, Judgment, Heaven, and Hell. In Christian eschatology, the Four Last Things (Latin: quattuor novissima) [1] are Death, Judgment, Heaven, and Hell, the four last stages of the soul in life and the afterlife.

  8. Takamagahara - Wikipedia

    en.wikipedia.org/wiki/Takamagahara

    [9] [10] It is stated that the Ashihara-no-Nakatsukuni (葦原の中つ国, the world between Heaven and Hell) was subjugated by the gods from Takamagahara, and the grandson of Amaterasu, Ninigi-no-Mikoto (瓊瓊杵尊), descended from Takamagahara to rule the area. From then on, the emperor, a descendant of Ninigi-no-Mikoto owned Ashihara-no ...

  9. Angle - Wikipedia

    en.wikipedia.org/wiki/Angle

    An angle smaller than a right angle (less than 90°) is called an acute angle [11] ("acute" meaning "sharp"). An angle equal to ⁠ 1 / 4 ⁠ turn (90° or ⁠ π / 2 ⁠ radians) is called a right angle. Two lines that form a right angle are said to be normal, orthogonal, or perpendicular. [12]