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  2. Rhombus - Wikipedia

    en.wikipedia.org/wiki/Rhombus

    The rhombus has a square as a special case, and is a special case of a kite and parallelogram. In plane Euclidean geometry , a rhombus ( pl. : rhombi or rhombuses ) is a quadrilateral whose four sides all have the same length.

  3. Quadrilateral - Wikipedia

    en.wikipedia.org/wiki/Quadrilateral

    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). Oblong: longer than wide, or wider than long (i.e., a rectangle that is not a square). [5] Kite: two pairs of adjacent sides are of equal length.

  4. History of geometry - Wikipedia

    en.wikipedia.org/wiki/History_of_geometry

    Square; Rectangle; Rhombus; Rhomboid; ... intersection of the diagonals to any side of the quadrilateral always bisects the ... the square root of 10 (or approx 3.162 ...

  5. Rhomboid - Wikipedia

    en.wikipedia.org/wiki/Rhomboid

    Traditionally, in two-dimensional geometry, a rhomboid is a parallelogram in which adjacent sides are of unequal lengths and angles are non-right angled.. The terms "rhomboid" and "parallelogram" are often erroneously conflated with each other (i.e, when most people refer to a "parallelogram" they almost always mean a rhomboid, a specific subtype of parallelogram); however, while all rhomboids ...

  6. List of polygons, polyhedra and polytopes - Wikipedia

    en.wikipedia.org/wiki/List_of_polygons...

    Octagonal prism, Square antiprism, Square cupola, Pentagonal bipyramid, Augmented pentagonal prism Dodecahedron Pentagonal antiprism , Decagonal prism , Pentagonal cupola , Snub disphenoid , Elongated square bipyramid , Metabidiminished icosahedron , Hexagonal bipyramid , Hexagonal trapezohedron , Triakis tetrahedron , Rhombic dodecahedron ...

  7. 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 rootrectangle is a dynamic rectangle but not a root rectangle. Its diagonal equals φ times the length of the shorter side. If a rootrectangle is divided by a diagonal, the result is two congruent Kepler triangles.

  8. 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.

  9. Parallelogon - Wikipedia

    en.wikipedia.org/wiki/Parallelogon

    Rectangle & rhombus: Dih 2, order 4 Square: Dih 4, order 8 6 Elongated parallelogram: ... Rhombus cmm (2*22) Rectangle pmm (*2222) Parallelogram p2 (2222)