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  2. Volume of an n-ball - Wikipedia

    en.wikipedia.org/wiki/Volume_of_an_n-ball

    The base cases of the induction are the 0-ball and the 1-ball, which can be checked directly using the facts Γ(1) = 1 and Γ(⁠ 3 / 2 ⁠) = ⁠ 1 / 2 ⁠ · Γ(⁠ 1 / 2 ⁠) = ⁠ √ π / 2 ⁠. The inductive step is similar to the above, but instead of applying proportionality to the volumes of the ( n − 2) -balls, the inductive ...

  3. Orders of magnitude (length) - Wikipedia

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

    4.3 cm – minimum diameter of a golf ball [114] 5 cm – usual diameter of a chicken egg; 5 cm – height of a hummingbird, the smallest-known bird; 5.08 cm – 2 inches, 5.5 × 5.5 × 5.5 cm – dimensions of a 3x3x3 Rubik's cube; 6.1 cm – average height of an apple; 7.3–7.5 cm – diameter of a baseball [28]

  4. Ball (mathematics) - Wikipedia

    en.wikipedia.org/wiki/Ball_(mathematics)

    A ball in n dimensions is called a hyperball or n-ball and is bounded by a hypersphere or (n−1)-sphere. Thus, for example, a ball in the Euclidean plane is the same thing as a disk, the area bounded by a circle. In Euclidean 3-space, a ball is taken to be the volume bounded by a 2-dimensional sphere. In a one-dimensional space, a ball is a ...

  5. Spaldeen - Wikipedia

    en.wikipedia.org/wiki/Spaldeen

    Modern-day Spaldeen. A Spalding Hi-Bounce Ball, often called a Spaldeen or a Pensie Pinkie, is a rubber ball, described as a tennis ball core without the felt. [1] These balls are commonly used in street games developed in the mid-20th century, such as Chinese handball (a variation on American handball), Australian Handball, stoop ball, hit-the-penny (involving trying to make a penny flip on a ...

  6. List of scale model sizes - Wikipedia

    en.wikipedia.org/wiki/List_of_scale_model_sizes

    At 1 inch in this scale = 6 feet (man's height) in the real world. Aircraft, science fiction, space non fiction, figures, vehicles, and watercraft. Now the most prolific [ 11 ] small scale (i.e. less than 1:35) for plastic injection armoured fighting vehicle (AFV) models, and also plastic model figurines and scale model vehicles and aircraft by ...

  7. Ball (association football) - Wikipedia

    en.wikipedia.org/wiki/Ball_(association_football)

    Regulation size and weight for a football is a circumference of 68–70 cm (27–28 in) and a weight of 410–450 g (14–16 oz). The ball is inflated to a pressure of 0.6–1.1 bars (8.7–16.0 psi) at sea level. [20] This is known as "Size 5". Smaller balls, Sizes 1, 3, and 4, are also produced for younger players or as training tools. [20]

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