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  2. Parallelogram - Wikipedia

    en.wikipedia.org/wiki/Parallelogram

    The area of the parallelogram is the area of the blue region, which is the interior of the parallelogram. The base × height area formula can also be derived using the figure to the right. The area K of the parallelogram to the right (the blue area) is the total area of the rectangle less the area of the two orange triangles. The area of the ...

  3. Quadrilateral - Wikipedia

    en.wikipedia.org/wiki/Quadrilateral

    Српски / srpski; ... This is a special case of the n-gon interior angle sum formula: S = (n − 2 ... In the case of a parallelogram, the latter formula ...

  4. Square - Wikipedia

    en.wikipedia.org/wiki/Square

    A square is a special case of a rhombus (equal sides, opposite equal angles), a kite (two pairs of adjacent equal sides), a trapezoid (one pair of opposite sides parallel), a parallelogram (all opposite sides parallel), a quadrilateral or tetragon (four-sided polygon), and a rectangle (opposite sides equal, right-angles), and therefore has all ...

  5. Cross product - Wikipedia

    en.wikipedia.org/wiki/Cross_product

    Српски / srpski; ... The cross product is defined by the formula [8] [9] ... The area of a parallelogram as the magnitude of a cross product Figure 2. Three ...

  6. Parallelogram law - Wikipedia

    en.wikipedia.org/wiki/Parallelogram_law

    Vectors involved in the parallelogram law. In a normed space, the statement of the parallelogram law is an equation relating norms: ‖ ‖ + ‖ ‖ = ‖ + ‖ + ‖ ‖,.. The parallelogram law is equivalent to the seemingly weaker statement: ‖ ‖ + ‖ ‖ ‖ + ‖ + ‖ ‖, because the reverse inequality can be obtained from it by substituting (+) for , and () for , and then simplifying.

  7. Trapezoid - Wikipedia

    en.wikipedia.org/wiki/Trapezoid

    Српски / srpski; ... otherwise, the trapezoid is a parallelogram, ... The formula is also a special case of Bretschneider's formula for a general quadrilateral).

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  9. Parallelepiped - Wikipedia

    en.wikipedia.org/wiki/Parallelepiped

    Српски / srpski; ... Thus a parallelogram is a 2-parallelotope and a parallelepiped is a 3 ... A formula to compute the volume of an n-parallelotope ...