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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. List of formulas in elementary geometry - Wikipedia

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

    Perimeter/Circumference Meanings of symbols ... Parallelogram (+) is base, is ... This is a list of volume formulas of basic shapes: [4]: ...

  4. Circumference - Wikipedia

    en.wikipedia.org/wiki/Circumference

    The circumference of a circle is the distance around it, but if, as in many elementary treatments, distance is defined in terms of straight lines, this cannot be used as a definition. Under these circumstances, the circumference of a circle may be defined as the limit of the perimeters of inscribed regular polygons as the number of sides ...

  5. Ellipse - Wikipedia

    en.wikipedia.org/wiki/Ellipse

    The area formula is intuitive: start with a circle of radius (so its area is ) and stretch it by a factor / to make an ellipse. This scales the area by the same factor: π b 2 ( a / b ) = π a b . {\displaystyle \pi b^{2}(a/b)=\pi ab.} [ 18 ] However, using the same approach for the circumference would be fallacious – compare the integrals

  6. Area of a circle - Wikipedia

    en.wikipedia.org/wiki/Area_of_a_circle

    For a polygon with 2n sides, the parallelogram will have a base of length ns, and a height h. As the number of sides increases, the length of the parallelogram base approaches half the circle circumference, and its height approaches the circle radius. In the limit, the parallelogram becomes a rectangle with width π r and height r.

  7. Area formulas - Wikipedia

    en.wikipedia.org/wiki/Area

    A parallelogram can be cut up and re-arranged to form a rectangle. ... This can be seen from the area formula πr 2 and the circumference formula 2πr.

  8. Hooper's paradox - Wikipedia

    en.wikipedia.org/wiki/Hooper's_paradox

    The area of this parallelogram can determined using Heron's formula for triangles. This yields = + + = + + for the halved circumference of the triangle (half of the parallelogram) and with that for the area of the parallelogram

  9. 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.