A trapezoid (in North America) or a trapezium (in Britain and elsewhere) is a quadrilateral, which is defined as a shape with four sides, that has one pair of parallel lines for sides. Some authors [1] define it as a quadrilateral having exactly one pair of parallel sides, so as to exclude parallelograms, which otherwise would be regarded as a special type of trapezoid, but most mathematicians use the inclusive definition.[2] Trapezoid may refer to: Trapezoid, either of two geometric figures Trapeze, an acrobatic device shaped like a trapezoid Trapezoid bone, a bone in the hand Trapezoid, an American folk music group The former musical project of Neil Cicierega, before forming Lemon Demon. ... Image File history File links Trapezoid. ... This article is about the geometric shape. ... Parallel is a term in geometry and in everyday life that refers to a property in Euclidean space of two or more lines or planes, or a combination of these. ... A parallelogram. ...
In North America, the term trapezium is used to refer to a quadrilateral with no parallel sides. The term trapezoid was once defined as a quadrilateral without any parallel sides in Britain and elsewhere[3], but this usage is now obsolete. [4]
2008 (MMVIII) is the current year, a leap year that started on Tuesday of the Anno Domini (or common era), in accordance to the Gregorian calendar. ... is the 104th day of the year (105th in leap years) in the Gregorian calendar. ... 2008 (MMVIII) is the current year, a leap year that started on Tuesday of the Anno Domini (or common era), in accordance to the Gregorian calendar. ... is the 104th day of the year (105th in leap years) in the Gregorian calendar. ... Year 2007 (MMVII) was a common year starting on Monday of the Gregorian calendar in the 21st century. ... is the 344th day of the year (345th in leap years) in the Gregorian calendar. ...
In an isoscelestrapezoid, the base angles are congruent, and so are the pair of non-parallel opposite sides.
The area of a trapezoid can be computed as the arithmetic mean of the lengths of the two parallel sides, multiplied by the distance along a perpendicular line between them.
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