File:Rectangle_Geometry_Vector.svg · Wikimedia Commons · See Wikimedia Commons

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矩形

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Also known as rectangular

有一个角是直角的平行四边形

AI overview

A rectangle is a four-sided shape where all four corners are right angles (90 degrees), making it one of the most common and useful geometric forms. Rectangles matter because they appear everywhere in the real world—from buildings and windows to screens and pieces of paper—and their simple, predictable properties make them fundamental to mathematics, design, and engineering.

AI-generated from the Wikipedia summary — may contain errors.

Key facts

Polygon.name: Rectangle
Polygon.image: Rectangle_Geometry_Vector.svg
Polygon.caption: Rectangle
Polygon.type: quadrilateral, trapezium, parallelogram, orthotope
Polygon.edges: 4
Polygon.symmetry: Dihedral (D2), [2], (*22), order 4
Polygon.schläfli: { } × { }
Polygon.dual: rhombus
Polygon.properties: convex, isogonal, cyclic Opposite angles and sides are congruent

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Wikidata facts

Instance of: geometric shape
Subclass of: quadrilateral
Has part: area
Image: Prostokat-rectangle.svg

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studied by: graph theory
dual to: rhombus
Commons category: Rectangles
maintained by WikiProject: WikiProject Mathematics
has facet polytope: edge
on focus list of Wikimedia project: Wikipedia:Vital articles/Level/4

Sources (4)

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Article · 中文

在几何中，矩形定义为有一个角是直角的平行四边形，即长方形。从这个定义可以得出矩形两条相对的边等长，也就是说矩形是平行四边形。正方形是四個邊都等長的矩形，它的四个边都是等长的。对于长方形两对相对的边，我们称横边为长，竖边为宽。长方形的面积是长和宽的乘积；用符号表示就是：A = lw。如图，一个长方形的长是5米，宽是4米，那么面积为20平方米，因为5 × 4 = 20。在微积分中，黎曼积分可以被看成是无穷多任意小的长方形面积的和的極限。

Abstract from DBpedia / Wikipedia · CC BY-SA

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