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  2. Ring size - Wikipedia

    en.wikipedia.org/wiki/Ring_size

    In the United States, Canada, and Mexico, ring sizes are specified using a numerical scale with 1⁄4 steps, where whole sizes differ by 0.032 inches (0.81 mm) of internal diameter, equivalent to 0.1005 inches (2.55 mm) of internal circumference. The relationship of this size ( ) to ISO 8653:2016 circumference ( ) is , while the relationship to ...

  3. Tree measurement - Wikipedia

    en.wikipedia.org/wiki/Tree_measurement

    These most likely use diameter measured at breast height, 4.5 feet (140 cm) above ground, not the larger base diameter. A general model for any year and diameter is Value = 17.27939*(diameter^2)*1.0279^(year-1985) ...assuming 2.79% inflation per year.

  4. Dohyō - Wikipedia

    en.wikipedia.org/wiki/Dohyō

    A dohyō (土俵, Japanese pronunciation: [doçoː]) is the space in which a sumo wrestling bout occurs. A typical dohyō is a circle made of partially buried rice- straw bales 4.55 meters in diameter. In official professional tournaments (honbasho), it is mounted on a square platform of clay 66 cm high and 6.7m wide on each side.

  5. Rings of Saturn - Wikipedia

    en.wikipedia.org/wiki/Rings_of_Saturn

    The attenuation of 0.94-, 3.6-, and 13-cm signals sent by Cassini through the rings to Earth shows abundance of particles of sizes similar to or larger than those wavelengths. Purple (B, inner A Ring) means few particles are < 5 cm (all signals similarly attenuated).

  6. Napkin ring problem - Wikipedia

    en.wikipedia.org/wiki/Napkin_ring_problem

    In geometry, the napkin-ring problem involves finding the volume of a "band" of specified height around a sphere, i.e. the part that remains after a hole in the shape of a circular cylinder is drilled through the center of the sphere. It is a counterintuitive fact that this volume does not depend on the original sphere's radius but only on the ...

  7. Boxing ring - Wikipedia

    en.wikipedia.org/wiki/Boxing_ring

    A boxing ring, often referred to ... The ropes are approximately 1 inch (25 mm) in diameter and at heights of 18, 30, 42, and 54 inches (.46, .76, 1.07, and 1.37 m ...

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