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  2. Circular mean - Wikipedia

    en.wikipedia.org/wiki/Circular_mean

    The angle is a reasonable mean of the input angles. The resulting radius will be 1 if all angles are equal. If the angles are uniformly distributed on the circle, then the resulting radius will be 0, and there is no circular mean. (In fact, it is impossible to define a continuous mean operation on the circle.) In other words, the radius ...

  3. Area of a circle - Wikipedia

    en.wikipedia.org/wiki/Area_of_a_circle

    The transformation sends the circle to an ellipse by stretching or shrinking the horizontal and vertical diameters to the major and minor axes of the ellipse. The square gets sent to a rectangle circumscribing the ellipse. The ratio of the area of the circle to the square is π /4, which means the ratio of the ellipse to the rectangle is also π /4

  4. 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.

  5. Circle - Wikipedia

    en.wikipedia.org/wiki/Circle

    A circle bounds a region of the plane called a disc. The circle has been known since before the beginning of recorded history. Natural circles are common, such as the full moon or a slice of round fruit. The circle is the basis for the wheel, which, with related inventions such as gears, makes much of modern

  6. Geometric mean - Wikipedia

    en.wikipedia.org/wiki/Geometric_mean

    The radius of the circle is the geometric mean of the semi-major and the semi-minor axes of the ellipse formed by deforming the circle. Distance to the horizon of a sphere (ignoring the effect of atmospheric refraction when atmosphere is present) is equal to the geometric mean of the distance to the closest point of the sphere and the distance ...

  7. Mean - Wikipedia

    en.wikipedia.org/wiki/Mean

    A mean is a quantity representing the "center" of a collection of numbers and is ... PR is the diameter of a circle centered ... The integration formula is written as

  8. Here’s What to Say to Comfort Someone Who Just Had a ... - AOL

    www.aol.com/heres-comfort-someone-just-had...

    “Active listening does not mean talking, like interjecting or interrupting with your own thoughts,” explains Ce Anderson, a licensed psychotherapist and trauma recovery expert. “It means ...

  9. Equivalent radius - Wikipedia

    en.wikipedia.org/wiki/Equivalent_radius

    In applied sciences, the equivalent radius (or mean radius) is the radius of a circle or sphere with the same perimeter, area, or volume of a non-circular or non-spherical object. The equivalent diameter (or mean diameter ) ( D {\displaystyle D} ) is twice the equivalent radius.