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  2. Rhombus - Wikipedia

    en.wikipedia.org/wiki/Rhombus

    A rhombus has all sides equal, while a rectangle has all angles equal. A rhombus has opposite angles equal, while a rectangle has opposite sides equal. A rhombus has an inscribed circle, while a rectangle has a circumcircle. A rhombus has an axis of symmetry through each pair of opposite vertex angles, while a rectangle has an axis of symmetry ...

  3. Parallelogram - Wikipedia

    en.wikipedia.org/wiki/Parallelogram

    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 . The perimeter of a parallelogram is 2( a + b ) where a and b are the lengths of adjacent sides.

  4. Genus–differentia definition - Wikipedia

    en.wikipedia.org/wiki/Genus–differentia_definition

    a square: a rhombus that has interior angles which are all right angles. In fact, the definition of a square may be recast in terms of both of the abstractions, where one acts as the genus and the other acts as the differentia: a square: a rectangle that is a rhombus. a square: a rhombus that is a rectangle.

  5. Parallelogon - Wikipedia

    en.wikipedia.org/wiki/Parallelogon

    Rhombus cmm (2*22) Rectangle pmm (*2222) Parallelogram p2 (2222) Hexagonal parallelogon tilings 1 length 2 lengths 3 lengths Regular hexagon p6m (*632) Elongated rhombus

  6. Van Hiele model - Wikipedia

    en.wikipedia.org/wiki/Van_Hiele_model

    A shape is a circle because it looks like a sun; a shape is a rectangle because it looks like a door or a box; and so on. A square seems to be a different sort of shape than a rectangle, and a rhombus does not look like other parallelograms, so these shapes are classified completely separately in the child’s mind.

  7. Kite (geometry) - Wikipedia

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

    A quadrilateral is a kite if and only if any one of the following conditions is true: The four sides can be split into two pairs of adjacent equal-length sides. [7] One diagonal crosses the midpoint of the other diagonal at a right angle, forming its perpendicular bisector. [9] (In the concave case, the line through one of the diagonals bisects ...

  8. The Most Common Reasons People See the Doctor for Scalp Pain

    www.aol.com/most-common-reasons-people-see...

    Whether it comes on suddenly or has been building for a while, dealing with scalp pain is distracting and uncomfortable. It also raises questions like, “why does my scalp hurt?” as well as ...

  9. Euclidean geometry - Wikipedia

    en.wikipedia.org/wiki/Euclidean_geometry

    Euclidean geometry is an axiomatic system, in which all theorems ("true statements") are derived from a small number of simple axioms. Until the advent of non-Euclidean geometry, these axioms were considered to be obviously true in the physical world, so that all the theorems would be equally true. However, Euclid's reasoning from assumptions ...