# Dictionary Definition

rectangle n : a parallelogram with four right
angles

# User Contributed Dictionary

## English

### Pronunciation

### Noun

rectangle (plural rectangles)- A quadrilateral having opposing sides parallel and four right angles.

#### Synonyms

- (quadrilateral): oblong (not in technical use)

#### Translations

quadrilateral

- Chinese: 长方形 (chángfāngxíng, changfangxing, chang2fang1xing2), (changfang, chang2fang1)
- Croatian: pravokutnik
- Czech: obdélník
- Dutch: rechthoek
- Finnish: suorakulmio
- French: rectangle
- Irish: dronuilleog
- German: Rechteck
- Hebrew:
- Hindi: आयत, समकोण समानान्तर चतुर्भुज
- Ido: rektangulo
- Italian: rettangolo
- Japanese: 長方形 (ちょうほうけい, chōhōkei)
- Polish: prostokąt
- Russian: прямоугольник
- Scottish Gaelic: dronn-uileannag , ceart-cheàrnach
- Serbian: pravougaonik , pravokutnik
- Slovene: pravokotnik
- Spanish: rectángulo
- Telugu: దీర్ఘ చతురస్రం (deergha chatirasraM)

# Extensive Definition

In geometry, a rectangle is
defined as a quadrilateral where all
four of its angles are right angles.
A rectangle with vertices ABCD would be denoted as
rectanglenotation ABCD.

From this definition, it follows that a rectangle
has two pairs of parallel sides; that is, a rectangle is a parallelogram. 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. 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. For example, the area of a rectangle
with a length of 5 and a width of 4 would be 20, because 5 \times 4
= 20.

In a rectangle the diagonals cross each other at
their respective midpoints, under the same argument as for parallelograms. 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 calculus, the Riemann
integral can be thought of as a limit
of sums of the areas of
arbitrarily thin rectangles.

## See also

## External links

- Animated course (Construction, Circumference, Area)
- Definition and properties of a rectangle With interactive animation
- Area of a rectangle with interactive animation

rectangle in Asturian: Rectángulu

rectangle in Aymara: Wiskhalla

rectangle in Bengali: আয়তক্ষেত্র

rectangle in Bosnian: Pravougaonik

rectangle in Breton: Skouergorneg

rectangle in Bulgarian: Правоъгълник

rectangle in Catalan: Rectangle

rectangle in Czech: Obdélník

rectangle in Danish: Rektangel

rectangle in German: Rechteck

rectangle in Estonian: Ristkülik

rectangle in Modern Greek (1453-): Ορθογώνιο
παραλληλόγραμμο

rectangle in Spanish: Rectángulo

rectangle in Esperanto: Ortangulo

rectangle in Basque: Laukizuzen

rectangle in Persian: مستطیل

rectangle in French: Rectangle

rectangle in Korean: 직사각형

rectangle in Hindi: आयत

rectangle in Indonesian: Persegi panjang

rectangle in Icelandic: Rétthyrningur

rectangle in Italian: Rettangolo

rectangle in Hebrew: מלבן

rectangle in Georgian: მართკუთხედი

rectangle in Swahili (macrolanguage):
Mstatili

rectangle in Haitian: Rektang

rectangle in Lao: ຮູບສີ່ແຈສາກ

rectangle in Latvian: Taisnstūris

rectangle in Lithuanian: Stačiakampis

rectangle in Limburgan: Rechhook

rectangle in Hungarian: Téglalap

rectangle in Dutch: Rechthoek

rectangle in Japanese: 長方形

rectangle in Norwegian: Rektangel

rectangle in Norwegian Nynorsk: Rektangel

rectangle in Central Khmer: ចតុកោណកែង

rectangle in Polish: Prostokąt

rectangle in Portuguese: Rectângulo

rectangle in Romanian: Dreptunghi

rectangle in Quechua: Wask'a

rectangle in Russian: Прямоугольник

rectangle in Sicilian: Rittànculu

rectangle in Simple English: Rectangle

rectangle in Slovak: Obdĺžnik

rectangle in Slovenian: Pravokotnik

rectangle in Serbian: Правоугаоник

rectangle in Finnish: Suorakulmio

rectangle in Swedish: Rektangel

rectangle in Tagalog: Parihaba

rectangle in Tamil: செவ்வகம்

rectangle in Thai: รูปสี่เหลี่ยมผืนผ้า

rectangle in Vietnamese: Hình chữ nhật

rectangle in Turkish: Dikdörtgen

rectangle in Ukrainian: Прямокутник

rectangle in Vlaams: Rechtoek

rectangle in Chinese: 矩形

# Synonyms, Antonyms and Related Words

Little Joe, biquadrate, four, four-part diaphony, foursome, quad, quadrangle, quadrature, quadrennium, quadrilateral, quadrille, quadrinomial, quadruplet, quartet, quatern, quaternary, quaternion, quaternity, quatrefoil, square, square dance, squaring, tetrad, tetragon, tetragram, tetragrammaton, tetrahedron, tetralogy, tetraphony, tetrapody