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1.a part of a structure having some specific characteristic or function"the spacious cooking area provided plenty of room for servants"
2.the extent of a 2-dimensional surface enclosed within a boundary"the area of a rectangle" "it was about 500 square feet in area"
3.a part of an animal that has a special function or is supplied by a given artery or nerve"in the abdominal region"
4.a subject of study"it was his area of specialization" "areas of interest include..."
5.a particular geographical region of indefinite boundary (usually serving some special purpose or distinguished by its people or culture or geography)"it was a mountainous area" "Bible country"
6.a particular environment or walk of life"his social sphere is limited" "it was a closed area of employment" "he's out of my orbit"
AreaA"re*a (ā"r�*ȧ; 277), n.; pl. Areas (-ȧz) . [L. area a broad piece of level ground. Cf. Are, n.]
1. Any plane surface, as of the floor of a room or church, or of the ground within an inclosure; an open space in a building.
The Alban lake . . . looks like the area of some vast amphitheater. Addison.
2. The inclosed space on which a building stands.
3. The sunken space or court, giving ingress and affording light to the basement of a building.
4. An extent of surface; a tract of the earth's surface; a region; as, vast uncultivated areas.
5. (Geom.) The superficial contents of any figure; the surface included within any given lines; superficial extent; as, the area of a square or a triangle.
6. (Biol.) A spot or small marked space; as, the germinative area.
7. Extent; scope; range; as, a wide area of thought.
The largest area of human history and man's common nature. F. Harrison.
Dry area. See under Dry.
arena, belt, borough, capacity, country, county, department, district, domain, enclosure, expanse, field, land, locality, location, lot, neighbourhood, orbit, part, part of the country, parts, patch, plot, portion, province, range, region, scope, sector, space, sphere, study, surface, surface area, terrain, territory, tract, turf, walk, yard, zone
Area Analysis • Area Health Education Center • Area Health Education Centers • Area Postrema • Area Under Curve • Area, Medically Underserved • area 17 of Brodmann • area bombing • area code • area command • area export manager • area management • area martegiani • area of cardiac dullness • area of holding • area sales manager • area unit • industrial area • low-pressure area • motor area • no-go area • service area
European Economic Area • European audio-visual area • European industrial area • European legal area • European social area • agricultural area with environmental restrictions • area management • area of holding • built-up area • catch area • currency area • deprived urban area • disaster area • euro area • fishing area • free-trade area • green area • less-favoured agricultural area • local area network • maritime area • parking area • polluted area • protected area • residential area • sensitive area • suburban area • urban area • utilised agricultural area • wooded area
humain (élargi) (fr)[ClasseParExt...]
parts; area; region; part of the country; district[ClasseHyper.]
area (n.) [politics]
greatness, magnitude, size[Hyper.]
body part, part of the body[Hyper.]
issue, matter, subject, topic[Hyper.]
region; realm; domain; sector; sphere; line; branch[ClasseParExt.]
Area is a quantity that expresses the extent of a two-dimensional surface or shape in the plane. Area can be understood as the amount of material with a given thickness that would be necessary to fashion a model of the shape, or the amount of paint necessary to cover the surface with a single coat. It is the two-dimensional analog of the length of a curve (a one-dimensional concept) or the volume of a solid (a three-dimensional concept).
The area of a shape can be measured by comparing the shape to squares of a fixed size. In the International System of Units (SI), the standard unit of area is the square metre (m2), which is the area of a square whose sides are one metre long. A shape with an area of three square metres would have the same area as three such squares. In mathematics, the unit square is defined to have area one, and the area of any other shape or surface is a dimensionless real number.
There are several well-known formulas for the areas of simple shapes such as triangles, rectangles, and circles. Using these formulas, the area of any polygon can be found by dividing the polygon into triangles. For shapes with curved boundary, calculus is usually required to compute the area. Indeed, the problem of determining the area of plane figures was a major motivation for the historical development of calculus.
For a solid shape such as a sphere, cone, or cylinder, the area of its boundary surface is called the surface area. Formulas for the surface areas of simple shapes were computed by the ancient Greeks, but computing the surface area of a more complicated shape usually requires multivariable calculus.
Area plays an important role in modern mathematics. In addition to its obvious importance in geometry and calculus, area is related to the definition of determinants in linear algebra, and is a basic property of surfaces in differential geometry. In analysis, the area of a subset of the plane is defined using Lebesgue measure, though not every subset is measurable. In general, area in higher mathematics is seen as a special case of volume for two-dimensional regions.
An approach to defining what is meant by area is through axioms. For example, we may define area as a function a from a collection M of special kind of plane figures (termed measurable sets) to the set of real numbers which satisfies the following properties:
It can be proved that such an area function actually exists. (See, for example, Elementary Geometry from an Advanced Standpoint by Edwin Moise.)
Every unit of length has a corresponding unit of area, namely the area of a square with the given side length. Thus areas can be measure in square metres (m2), square centimetres (cm2), square millimetres (mm2), square kilometres (km2), square feet (ft2), square yards (yd2), square miles (mi2), and so forth. Algebraically, these units can be thought of as the squares of the corresponding length units.
The SI unit of area is the square metre, which is considered an SI derived unit.
The conversion between two square units is the square of the conversion between the corresponding length units. For example, since
the relationship between square feet and square inches is
where 144 = 122 = 12 × 12. Similarly:
Though the are has fallen out of use, the hectare is still commonly used to measure land:
The acre is also commonly used to measure land areas, where
An acre is approximately 40% of a hectare.
On the atomic scale, area is measured in units of barns, such that,
The barn is commonly used in describing the cross sectional area of interaction in nuclear physics.
The most basic area formula is the formula for the area of a rectangle. Given a rectangle with length l and w, the formula for the area is
That is, the area of the rectangle is the length multiplied by the width. As a special case, the area of a square with side length s is given by the formula
The formula for the area of a rectangle follows directly from the basic properties of area, and is sometimes taken as a definition or axiom. On the other hand, if geometry is developed before arithmetic, this formula can be used to define multiplication of real numbers.
For an example, any parallelogram can be subdivided into a trapezoid and a right triangle, as shown in figure to the left. If the triangle is moved to the other side of the trapezoid, then the resulting figure is a rectangle. It follows that the area of the parallelogram is the same as the area of the rectangle:
However, the same parallelogram can also be cut along a diagonal into two congruent triangles, as shown in the figure to the right. It follows that the area of each triangle is half the area of the parallelogram:
The formula for the area of a circle is based on a similar method. Given a circle of radius r, it is possible to partition the circle into sectors, as shown in the figure to the right. Each sector is approximately triangular in shape, and the sectors can be rearranged to form and approximate parallelogram. The height of this parallelogram is r, and the width is half the circumference of the circle, or πr. Thus, the total area of the circle is r × πr, or πr2:
Though the dissection used in this formula is only approximate, the error becomes smaller and smaller as the circle is partitioned into more and more sectors. The limit of the areas of the approximate parallelograms is exactly πr2, which is the area of the circle.
This argument is actually a simple application of the ideas of calculus. In ancient times, the method of exhaustion was used in a similar way to find the area of the circle, and this method is now recognized as a precursor to integral calculus. Using modern methods, the area of a circle can be computed using a definite integral:
Most basic formulae for surface area can be obtained by cutting surfaces and flattening them out. For example, if the side surface of a cylinder (or any prism) is cut lengthwise, the surface can be flattened out into a rectangle. Similarly, if a cut is made along the side of a cone, the side surface can be flattened out into a sector of a circle, and the resulting area computed.
The formula for the surface area of a sphere is more difficult: because the surface of a sphere has nonzero Gaussian curvature, it cannot be flattened out. The formula for the surface area of a sphere was first obtained by Archimedes in his work On the Sphere and Cylinder. The formula is
where r is the radius of the sphere. As with the formula for the area of a circle, any derivation of this formula inherently uses methods similar to calculus.
|Regular triangle (equilateral triangle)||is the length of one side of the triangle.|
|Triangle||is half the perimeter, , and are the length of each side.|
|Triangle||and are any two sides, and is the angle between them.|
|Triangle||and are the base and altitude (measured perpendicular to the base), respectively.|
|Square||is the length of one side of the square.|
|Rectangle||and are the lengths of the rectangle's sides (length and width).|
|Rhombus||and are the lengths of the two diagonals of the rhombus.|
|Parallelogram||is the length of the base and is the perpendicular height.|
|Trapezoid||and are the parallel sides and the distance (height) between the parallels.|
|Regular hexagon||is the length of one side of the hexagon.|
|Regular octagon||is the length of one side of the octagon.|
|Regular polygon||is the side length and is the number of sides.|
|Regular polygon||is the perimeter and is the number of sides.|
|Regular polygon||is the radius of a circumscribed circle, is the radius of an inscribed circle, and is the number of sides.|
|Regular polygon||is the apothem, or the radius of an inscribed circle in the polygon, and is the perimeter of the polygon.|
|Circle||is the radius and the diameter.|
|Circular sector||and are the radius and angle (in radians), respectively.|
|Ellipse||and are the semi-major and semi-minor axes, respectively.|
|Total surface area of a Cylinder||and are the radius and height, respectively.|
|Lateral surface area of a cylinder||and are the radius and height, respectively.|
|Total surface area of a Cone||and are the radius and slant height, respectively.|
|Lateral surface area of a cone||and are the radius and slant height, respectively.|
|Total surface area of a Sphere||and are the radius and diameter, respectively.|
|Total surface area of an ellipsoid||See the article.|
|Total surface area of a Pyramid||is the base area, is the base perimeter and is the slant height.|
|Square to circular area conversion||is the area of the square in square units.|
|Circular to square area conversion||is the area of the circle in circular units.|
The above calculations show how to find the area of many common shapes.
(see Green's theorem) or the z-component of
The general formula for the surface area of the graph of a continuously differentiable function where and is a region in the xy-plane with the smooth boundary:
Even more general formula for the area of the graph of a parametric surface in the vector form where is a continuously differentiable vector function of :
|Wikimedia Commons has media related to: Area|
|Look up area in Wiktionary, the free dictionary.|