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  2. Square - Wikipedia

    en.wikipedia.org/wiki/Square

    The diagonal of a square bisects its internal angle, forming adjacent angles of 45°. ... The area of a square is the product of the length of its sides.

  3. List of second moments of area - Wikipedia

    en.wikipedia.org/wiki/List_of_second_moments_of_area

    Regular polygons; Description Figure Second moment of area Comment A filled regular (equiliteral) triangle with a side length of a = = [6] The result is valid for both a horizontal and a vertical axis through the centroid, and therefore is also valid for an axis with arbitrary direction that passes through the origin.

  4. Orthodiagonal quadrilateral - Wikipedia

    en.wikipedia.org/wiki/Orthodiagonal_quadrilateral

    The area K of an orthodiagonal quadrilateral equals one half the product of the lengths of the diagonals p and q: [8] K = p q 2 . {\displaystyle K={\frac {pq}{2}}.} Conversely, any convex quadrilateral where the area can be calculated with this formula must be orthodiagonal. [ 6 ]

  5. Area - 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 ...

  6. Quadrilateral - Wikipedia

    en.wikipedia.org/wiki/Quadrilateral

    An equivalent condition is that opposite sides are parallel (a square is a parallelogram), and that the diagonals perpendicularly bisect each other and are of equal length. A quadrilateral is a square if and only if it is both a rhombus and a rectangle (i.e., four equal sides and four equal angles).

  7. Diagonal - Wikipedia

    en.wikipedia.org/wiki/Diagonal

    A square has two diagonals of equal length, which intersect at the center of the square. The ratio of a diagonal to a side is 2 ≈ 1.414. {\displaystyle {\sqrt {2}}\approx 1.414.} A regular pentagon has five diagonals all of the same length.

  8. Shulba Sutras - Wikipedia

    en.wikipedia.org/wiki/Shulba_Sutras

    1.9. The diagonal of a square produces double the area [of the square]. [...] 1.12. The areas [of the squares] produced separately by the lengths of the breadth of a rectangle together equal the area [of the square] produced by the diagonal. 1.13. This is observed in rectangles having sides 3 and 4, 12 and 5, 15 and 8, 7 and 24, 12 and 35, 15 ...

  9. Display size - Wikipedia

    en.wikipedia.org/wiki/Display_size

    Common screen dimensions are listed in the table below (the most common diagonal dimensions in inches as of 2020 are bolded). If the display is not listed, then the following equations can be used. Note that D is the diagonal (in centimeters or inches), W is the width (in pixels), and H is the height (in pixels).