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  2. 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, ...

  3. List of formulas in elementary geometry - Wikipedia

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

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

  4. Area formulas - Wikipedia

    en.wikipedia.org/wiki/Area

    That is, the area of the rectangle is the length multiplied by the width. As a special case, as l = w in the case of a square, the area of a square with side length s is given by the formula: [1] [2] A = s 2 (square). The formula for the area of a rectangle follows directly from the basic properties of area, and is sometimes taken as a ...

  5. 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

  6. Section modulus - Wikipedia

    en.wikipedia.org/wiki/Section_modulus

    This is an indication of a section's capacity beyond the yield strength of material. The shape factor for a rectangular section is 1.5. [1] The table below shows formulas for the plastic section modulus for various shapes.

  7. Perimeter - Wikipedia

    en.wikipedia.org/wiki/Perimeter

    Nevertheless, there is no relation between the area and the perimeter of an ordinary shape. For example, the perimeter of a rectangle of width 0.001 and length 1000 is slightly above 2000, while the perimeter of a rectangle of width 0.5 and length 2 is 5. Both areas are equal to 1.

  8. Torsion constant - Wikipedia

    en.wikipedia.org/wiki/Torsion_constant

    In 1820, the French engineer A. Duleau derived analytically that the torsion constant of a beam is identical to the second moment of area normal to the section J zz, which has an exact analytic equation, by assuming that a plane section before twisting remains planar after twisting, and a diameter remains a straight line.

  9. Solid angle - Wikipedia

    en.wikipedia.org/wiki/Solid_angle

    The formula for the magnitude of the solid angle in steradians is ... The solid angle of a latitude-longitude rectangle on a globe is ...