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  2. Arithmetic billiards - Wikipedia

    en.wikipedia.org/wiki/Arithmetic_billiards

    If one side length divides the other, the path is a zigzag consisting of one or more segments. Else, the path has self-intersections and consists of segments of various lengths in two orthogonal directions. In general, the path is the intersection of the rectangle with a grid of squares (oriented at 45° with respect to the rectangle sides). [1 ...

  3. Rectangle - Wikipedia

    en.wikipedia.org/wiki/Rectangle

    In Euclidean plane geometry, a rectangle is a rectilinear convex polygon or a quadrilateral with four right angles. It can also be defined as: an equiangular quadrilateral, since equiangular means that all of its angles are equal (360°/4 = 90°); or a parallelogram containing a right angle. A rectangle with four sides of equal length is a square.

  4. List of formulas in elementary geometry - Wikipedia

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

    Arc length – Distance along a curve; Area#Area formulas – Size of a two-dimensional surface; Perimeter#Formulas – Path that surrounds an area; List of second moments of area; List of surface-area-to-volume ratios – Surface area per unit volume; List of surface area formulas – Measure of a two-dimensional surface; List of trigonometric ...

  5. Perimeter - Wikipedia

    en.wikipedia.org/wiki/Perimeter

    In particular, the perimeter of a rectangle of width and length equals +. An equilateral polygon is a polygon which has all sides of the same length (for example, a rhombus is a 4-sided equilateral polygon). To calculate the perimeter of an equilateral polygon, one must multiply the common length of the sides by the number of sides.

  6. Girth (geometry) - Wikipedia

    en.wikipedia.org/wiki/Girth_(geometry)

    In three-dimensional geometry, the girth of a geometric object, in a certain direction, is the perimeter of its parallel projection in that direction. [1] [2] For instance, the girth of a unit cube in a direction parallel to one of the three coordinate axes is four: it projects to a unit square, which has four as its perimeter.

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    Valid Claim without Proof of Purchase: If you submit a claim without proof of purchase, you will receive $5.00 for the first product and $0.50 for each additional product up to a maximum of 10 ...

  8. Equable shape - Wikipedia

    en.wikipedia.org/wiki/Equable_shape

    The only equable rectangles with integer sides are the 4 × 4 square and the 3 × 6 rectangle. [4] An integer rectangle is a special type of polyomino, and more generally there exist polyominoes with equal area and perimeter for any even integer area greater than or equal to 16. For smaller areas, the perimeter of a polyomino must exceed its area.

  9. Fix problems signing in to AOL Mail

    help.aol.com/articles/fix-problems-signing-in-to...

    Learn how to fix common problems singing in to AOL Mail.