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  2. List of formulae involving π - Wikipedia

    en.wikipedia.org/wiki/List_of_formulae_involving_π

    where C is the circumference of a circle, d is the diameter, and r is the radius.More generally, = where L and w are, respectively, the perimeter and the width of any curve of constant width.

  3. Pi - Wikipedia

    en.wikipedia.org/wiki/Pi

    The number π (/ p aɪ /; spelled out as "pi") is a mathematical constant that is the ratio of a circle's circumference to its diameter, approximately equal to 3.14159.The number π appears in many formulae across mathematics and physics.

  4. Area of a circle - Wikipedia

    en.wikipedia.org/wiki/Area_of_a_circle

    The conventional definition in pre-calculus geometry is the ratio of the circumference of a circle to its diameter: π = C D . {\displaystyle \pi ={\frac {C}{D}}.} However, because the circumference of a circle is not a primitive analytical concept, this definition is not suitable in modern rigorous treatments.

  5. Mathematical constant - Wikipedia

    en.wikipedia.org/wiki/Mathematical_constant

    The constant π (pi) has a natural definition in Euclidean geometry as the ratio between the circumference and diameter of a circle. It may be found in many other places in mathematics: for example, the Gaussian integral, the complex roots of unity, and Cauchy distributions in probability. However, its ubiquity is not limited to pure mathematics.

  6. 10 comfort-food recipes to ease stress on election night - AOL

    www.aol.com/news/10-comfort-food-recipes-ease...

    Home & Garden. Lighter Side

  7. Quizlet - Wikipedia

    en.wikipedia.org/wiki/Quizlet

    [6] [7] [8] Quizlet's blog, written mostly by Andrew in the earlier days of the company, claims it had reached 50,000 registered users in 252 days online. [9] In the following two years, Quizlet reached its 1,000,000th registered user. [10] Until 2011, Quizlet shared staff and financial resources with the Collectors Weekly website. [11]

  8. Trump still hasn’t signed ethics agreement required for ...

    www.aol.com/trump-still-hasn-t-signed-203821555.html

    President-elect Donald Trump has not yet submitted a series of transition agreements with the Biden administration, in part because of concerns over the mandatory ethics pledge vowing to avoid ...

  9. US retailers aim to cash in on Cyber Monday with steep online ...

    www.aol.com/news/us-retailers-aim-cash-cyber...

    (Reuters) -After lackluster spending at U.S. stores on a deals-heavy Black Friday, retailers are pulling out all the stops with steep promotions and discounts on their websites and apps to entice ...