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  2. List of formulae involving π - Wikipedia

    en.wikipedia.org/wiki/List_of_formulae_involving_π

    is the number of collisions made (in ideal conditions, perfectly elastic with no friction) by an object of mass m initially at rest between a fixed wall and another object of mass b 2N m, when struck by the other object. [1] (This gives the digits of π in base b up to N digits past the radix point.)

  3. Machin-like formula - Wikipedia

    en.wikipedia.org/wiki/Machin-like_formula

    In the special case where the numerator =, there are exactly four solutions having only two terms. [ 7 ] [ 8 ] All four were found by John Machin in 1705–1706, but only one of them became widely known when it was published in William Jones 's book Synopsis Palmariorum Matheseos , so the other three are often attributed to other mathematicians.

  4. Zone defense in American football - Wikipedia

    en.wikipedia.org/wiki/Zone_defense_in_American...

    Cover 4, or quarters, refers to 4 deep defenders each guarding one-fourth of the deep zone. Cover 4 schemes are almost always used to defend against deep passes. [10] (See also Prevent defense). The most basic Cover 4 scheme involves 3 CBs and 2 safeties. Upon snap, the CBs work for depth, backpedaling into their assigned zone.

  5. What is Cover 2 defense? Two-high coverages in the NFL ... - AOL

    www.aol.com/cover-2-defense-two-high-201430076.html

    Here's what to know about Cover 2 defense. ... NFL teams are also averaging 2.5 sacks per game so far in 2024 and the league-wide sack rate of 7.7% is the highest figure since 1992. Defenses are ...

  6. List of mathematical constants - Wikipedia

    en.wikipedia.org/wiki/List_of_mathematical_constants

    A mathematical constant is a key number whose value is fixed by an unambiguous definition, often referred to by a symbol (e.g., an alphabet letter), or by mathematicians' names to facilitate using it across multiple mathematical problems. [1]

  7. 6–2 defense - Wikipedia

    en.wikipedia.org/wiki/6–2_defense

    The 62 is a defense that became popular in the 1930s due to the demands of the improving passing attacks of the time. In the early 1930s, pro football's passing rules were liberalized. [ 1 ] By the late 1930s, the two standard defenses in college and the NFL were the 62 and the 5–3.

  8. Mathematical constant - Wikipedia

    en.wikipedia.org/wiki/Mathematical_constant

    The square root of 2, often known as root 2 or Pythagoras' constant, and written as √ 2, is the unique positive real number that, when multiplied by itself, gives the number 2. It is more precisely called the principal square root of 2 , to distinguish it from the negative number with the same property.

  9. Nickel defense - Wikipedia

    en.wikipedia.org/wiki/Nickel_defense

    In American football, a nickel defense (also known as a 425 or 3–3–5) is any defensive alignment that uses five defensive backs, of whom the fifth is known as a nickelback. The original and most common form of the nickel defense features four down linemen and two linebackers .