In geometry, a rectangle is defined as a quadrilateral where all four of its angles are right angles. Geometry ( Greek γεωμετρία; geo = earth metria = measure is a part of Mathematics concerned with questions of size shape and relative position In Geometry, a quadrilateral is a Polygon with four sides or edges and four vertices or corners. In Geometry and Trigonometry, a right angle is an angle of 90 degrees corresponding to a quarter turn (that is a quarter of a full circle A rectangle with vertices ABCD would be denoted as ABCD.

From this definition, it follows that a rectangle has two pairs of parallel sides; that is, a rectangle is a parallelogram. In Geometry, a parallelogram is a Quadrilateral with two sets of Parallel sides A square is a special kind of rectangle where all four sides have equal length; that is, a square is both a rectangle and a rhombus. Classification A square (regular Quadrilateral) is a special case of a Rectangle as it has four right angles and equal parallel sides In Geometry, a rhombus (from Ancient Greek ῥόμβος - rrhombos “rhombus spinning top” (plural rhombi or rhombuses A rectangle that is not a square is colloquially known as an oblong.

Normally, of the two opposite pairs of sides in a rectangle, the length of the longer side is called the length of the rectangle, and the length of the shorter side is called the width.

The area of a rectangle is the product of its length and its width; in symbols, A = lw. Area is a Quantity expressing the two- Dimensional size of a defined part of a Surface, typically a region bounded by a closed Curve. For example, the area of a rectangle with a length of 5 and a width of 4 would be 20, because .

In a rectangle the diagonals cross each other at their respective midpoints, under the same argument as for parallelograms. In Geometry, a parallelogram is a Quadrilateral with two sets of Parallel sides Unlike general parallelograms the two diagonals of a rectangle have the same length, the length of the diagonal can be found using the Pythagorean theorem. In Mathematics, the Pythagorean theorem ( American English) or Pythagoras' theorem ( British English) is a relation in Euclidean geometry

In calculus, the Riemann integral can be thought of as a limit of sums of the areas of arbitrarily thin rectangles. Calculus ( Latin, calculus, a small stone used for counting is a branch of Mathematics that includes the study of limits, Derivatives In the branch of Mathematics known as Real analysis, the Riemann integral, created by Bernhard Riemann, was the first rigorous definition of the Integral In Mathematics, the concept of a " limit " is used to describe the Behavior of a function as its argument either "gets close" Addition is the mathematical process of putting things together

See also

• Rectorsal
• Cuboid
• Hyperrectangle
• Rectangular function
• Square (geometry)

External links

• Animated course (Construction, Circumference, Area)
• Eric W. Weisstein, Rectangle at MathWorld. In anatomy the Cuboid bone is a bone in the foot See also Hyperrectangle Oblong In Geometry, an orthotope (also called a hyperrectangle or a box) is the generalization of a Rectangle for higher dimensions formally defined The rectangular function (also known as the rectangle function, rect function, unit pulse, or the normalized Boxcar function) Classification A square (regular Quadrilateral) is a special case of a Rectangle as it has four right angles and equal parallel sides Eric W Weisstein (born March 18, 1969, in Bloomington Indiana) is an Encyclopedist who created and maintains MathWorld MathWorld is an online Mathematics reference work created and largely written by Eric W
• Definition and properties of a rectangle With interactive animation
• Area of a rectangle with interactive animation

© 2009 citizendia.org; parts available under the terms of GNU Free Documentation License, from http://en.wikipedia.org
Dapyx Software network: MP3 Explorer | Ebook Manager | Zenithic