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  2. Hydraulic diameter - Wikipedia

    en.wikipedia.org/wiki/Hydraulic_diameter

    The need for the hydraulic diameter arises due to the use of a single dimension in the case of a dimensionless quantity such as the Reynolds number, which prefers a single variable for flow analysis rather than the set of variables as listed in the table below. The Manning formula contains a quantity called the hydraulic radius.

  3. List of formulas in elementary geometry - Wikipedia

    en.wikipedia.org/wiki/List_of_formulas_in...

    Rectangle (+) is length, is ... is the diameter ... This is a list of volume formulas of basic shapes: [4]: 405–406 ...

  4. Rectangle - Wikipedia

    en.wikipedia.org/wiki/Rectangle

    The formula for the perimeter of a rectangle The area of a rectangle is the product of the length and width. ... A saddle rectangle has 4 nonplanar vertices, ...

  5. Perimeter - Wikipedia

    en.wikipedia.org/wiki/Perimeter

    formula variables circle = ... is the diameter. semicircle (+) ... For example, the perimeter of a rectangle of width 0.001 and length 1000 is slightly above 2000 ...

  6. Regular polygon - Wikipedia

    en.wikipedia.org/wiki/Regular_polygon

    Inscribed circle diameter ... As a corollary of the annulus chord formula, ... with the base, b of a rectangle with the same area.

  7. List of second moments of area - Wikipedia

    en.wikipedia.org/wiki/List_of_second_moments_of_area

    A filled rectangular area as above but with respect to an axis collinear with the base = = [4] This is a result from the parallel axis theorem: A hollow rectangle with an inner rectangle whose width is b 1 and whose height is h 1

  8. Solid angle - Wikipedia

    en.wikipedia.org/wiki/Solid_angle

    The solid angle of a latitude-longitude rectangle on a ... By using the definition of angular diameter, the formula for the solid angle of a celestial object can ...

  9. Diameter - Wikipedia

    en.wikipedia.org/wiki/Diameter

    In this context, a diameter is any chord which passes through the conic's centre. A diameter of an ellipse is any line passing through the centre of the ellipse. [7] Half of any such diameter may be called a semidiameter, although this term is most often a synonym for the radius of a circle or sphere. [8] The longest diameter is called the ...