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  2. Orders of magnitude (length) - Wikipedia

    en.wikipedia.org/wiki/Orders_of_magnitude_(length)

    1.4 km – diameter of Dactyl, the first confirmed asteroid moon; 4.8 km – diameter of 5535 Annefrank, an inner belt asteroid; 5 km – diameter of 3753 Cruithne; 5 km – length of PSR B1257+12; 8 km – diameter of Themisto, one of Jupiter's moons; 8 km – diameter of the Vela Pulsar; 8.6 km – diameter of Callirrhoe, also known as ...

  3. Golden ratio - Wikipedia

    en.wikipedia.org/wiki/Golden_ratio

    The Great Pyramid of Giza. The Great Pyramid of Giza (also known as the Pyramid of Cheops or Khufu) has been analyzed by pyramidologists as having a doubled Kepler triangle as its cross-section. If this theory were true, the golden ratio would describe the ratio of distances from the midpoint of one of the sides of the pyramid to its apex, and ...

  4. Octahedron - Wikipedia

    en.wikipedia.org/wiki/Octahedron

    The surface area of a regular octahedron can be ascertained by summing all of its eight equilateral triangles, whereas its volume is twice the volume of a square pyramid; if the edge length is , [11] =, =. The radius of a circumscribed sphere (one that touches the octahedron at all vertices), the radius of an inscribed sphere (one that tangent ...

  5. Special right triangle - Wikipedia

    en.wikipedia.org/wiki/Special_right_triangle

    Set square shaped as 45° - 45° - 90° triangle The side lengths of a 45° - 45° - 90° triangle 45° - 45° - 90° right triangle of hypotenuse length 1.. In plane geometry, dividing a square along its diagonal results in two isosceles right triangles, each with one right angle (90°, ⁠ π / 2 ⁠ radians) and two other congruent angles each measuring half of a right angle (45°, or ...

  6. Pyramid of Sahure - Wikipedia

    en.wikipedia.org/wiki/Pyramid_of_Sahure

    By comparison, the 800 m 2 (8,600 sq ft) temple of Sneferu's Red Pyramid at Dahshur, and 2,000 m 2 (22,000 sq ft) temple of Khufu's Great Pyramid had no storerooms, while the 1,265 m 2 (13,620 sq ft) temple of Khafre's pyramid reserved less than 200 m 2 (2,200 sq ft) of space for storerooms, accounting for 15.8% of its total area. This change ...

  7. Great Pyramid of Giza - Wikipedia

    en.wikipedia.org/wiki/Great_Pyramid_of_Giza

    The Great Pyramid of Giza [a] is the largest Egyptian pyramid.It served as the tomb of pharaoh Khufu, who ruled during the Fourth Dynasty of the Old Kingdom.Built c. 2600 BC, [3] over a period of about 26 years, [4] the pyramid is the oldest of the Seven Wonders of the Ancient World, and the only wonder that has remained largely intact.

  8. 68–95–99.7 rule - Wikipedia

    en.wikipedia.org/wiki/68–95–99.7_rule

    This holds ever more strongly for moves of 4 or more standard deviations. One can compute more precisely, approximating the number of extreme moves of a given magnitude or greater by a Poisson distribution , but simply, if one has multiple 4 standard deviation moves in a sample of size 1,000, one has strong reason to consider these outliers or ...

  9. List of United States cities by area - Wikipedia

    en.wikipedia.org/wiki/List_of_United_States...

    San Francisco is an extreme example: water makes up nearly 80% of its total area of 232 square miles (601 km 2). In many cases an incorporated place is geographically large because its municipal government has merged with the government of the surrounding county.