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  2. Dynamic rectangle - Wikipedia

    en.wikipedia.org/wiki/Dynamic_rectangle

    A root-phi rectangle divides into a pair of Kepler triangles (right triangles with edge lengths in geometric progression). The root-φ rectangle is a dynamic rectangle but not a root rectangle. Its diagonal equals φ times the length of the shorter side. If a root-φ rectangle is divided by a diagonal, the result is two congruent Kepler triangles.

  3. File:Root phi rectangle.svg - Wikipedia

    en.wikipedia.org/wiki/File:Root_phi_rectangle.svg

    English: A root-phi rectangle, shown with division into a pair of Kepler triangles, the only right triangles with edge lengths in geometric progression. Date 3 June 2008

  4. Talk:Root rectangle - Wikipedia

    en.wikipedia.org/wiki/Talk:Root_rectangle

    The article says that root rectangles are part of the broader group of dynamic rectangles. It also says that dynamic rectangles have irrational (in the mathematical sense) proportions. But a lot of root rectangles have rational proportions. Hambidge himself illustrates a root-4 rectangle, which is rational. So is root-1, a square.

  5. IM 67118 - Wikipedia

    en.wikipedia.org/wiki/IM_67118

    The tablet measures 11.5×6.8×3.3 cm (4½" x 2¾" x 1¼"). [4] Its language is Akkadian, written in cuneiform script. There are 19 lines of text on the tablet's obverse and six on its reverse. The reverse also contains a diagram consisting of the rectangle of the problem and one of its diagonals.

  6. Root system - Wikipedia

    en.wikipedia.org/wiki/Root_system

    If is a root system, the Dynkin diagram for the dual root system is obtained from the Dynkin diagram of by keeping all the same vertices and edges, but reversing the directions of all arrows. Thus, we can see from their Dynkin diagrams that B n {\displaystyle B_{n}} and C n {\displaystyle C_{n}} are dual to each other.

  7. File:Rectangle example.svg - Wikipedia

    en.wikipedia.org/wiki/File:Rectangle_example.svg

    The following other wikis use this file: Usage on ab.wikipedia.org Акәакьиаша; Usage on ar.wikipedia.org مستطيل; Usage on as.wikipedia.org

  8. Rectangle - Wikipedia

    en.wikipedia.org/wiki/Rectangle

    A crossed rectangle is a crossed (self-intersecting) quadrilateral which consists of two opposite sides of a rectangle along with the two diagonals [4] (therefore only two sides are parallel). It is a special case of an antiparallelogram , and its angles are not right angles and not all equal, though opposite angles are equal.

  9. File:B7 root diagram BC4plane.svg - Wikipedia

    en.wikipedia.org/wiki/File:B7_root_diagram_BC4...

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