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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 ...
The first property implies that every rhombus is a parallelogram. A rhombus therefore has all of the properties of a parallelogram: for example, opposite sides are parallel; adjacent angles are supplementary; the two diagonals bisect one another; any line through the midpoint bisects the area; and the sum of the squares of the sides equals the ...
A parallelogram has rotational symmetry of order 2 (through 180°) (or order 4 if a square). If it also has exactly two lines of reflectional symmetry then it must be a rhombus or an oblong (a non-square rectangle). If it has four lines of reflectional symmetry, it is a square.
Parallelogram: a quadrilateral with two pairs of parallel sides. Equivalent conditions are that opposite sides are of equal length; that opposite angles are equal; or that the diagonals bisect each other. Parallelograms include rhombi (including those rectangles called squares) and rhomboids (including those rectangles called oblongs).
P = Parallelogram H = Rhomboid; R = Rhombus; E = Rectangle O = Oblong; S = Square — Sebastian 18:07, 10 May 2015 (UTC) To be honest, I'm not so keen on the idea of labelling corners: Due to the spacing of the lines, the corners are no longer discernible points so it's unclear which vertices belong to which corners.
A rhombus is an orthodiagonal quadrilateral with two pairs of parallel sides (that is, an orthodiagonal quadrilateral that is also a parallelogram). A square is a limiting case of both a kite and a rhombus. Orthodiagonal quadrilaterals that are also equidiagonal quadrilaterals are called midsquare quadrilaterals. [2]
Pages for logged out editors learn more. ... Print/export Download as PDF ... Elongated rhombus cmm (2*22) Elongated parallelogram p2 (2222) References
Print/export Download as PDF; Printable version; In other projects ... Rhombus (equilateral parallelogram) Lozenge; Rhomboid; Rectangle. square (regular quadrilateral)