Contents 
Shape  Formula  Variables 

Regular triangle (equilateral triangle)  s is the length of one side of the triangle.  
Triangle  s is half the perimeter, a, b and c are the length of each side.  
Triangle  a and b are any two sides, and C is the angle between them.  
Triangle  b and h are the base and altitude (measured perpendicular to the base), respectively.  
Square  s is the length of one side of the square.  
Rectangle  l and w are the lengths of the rectangle's sides (length and width).  
Rhombus  a and b are the lengths of the two diagonals of the rhombus.  
Parallelogram  b is the length of the base and h is the perpendicular height.  
Trapezoid  a and b are the parallel sides and h the distance (height) between the parallels.  
Regular hexagon  s is the length of one side of the hexagon.  
Regular octagon  s is the length of one side of the octagon.  
Regular polygon  s is the sidelength and n is the number of sides.  
a is the apothem, or the radius of an inscribed circle in the polygon, and p is the perimeter of the polygon.  
Circle  r is the radius and d the diameter.  
Circular sector  r and θ are the radius and angle (in radians), respectively.  
Ellipse  a and b are the semimajor and semiminor axes, respectively.  
Total surface area of a Cylinder  r and h are the radius and height, respectively.  
Lateral surface area of a cylinder  r and h are the radius and height, respectively.  
Total surface area of a Cone  r and l are the radius and slant height, respectively.  
Lateral surface area of a cone  r and l are the radius and slant height, respectively.  
Total surface area of a Sphere  r and d are the radius and diameter, respectively.  
Total surface area of an ellipsoid  See the article.  
Square to circular area conversion  A is the area of the square in square units.  
Circular to square area conversion  C is the area of the circle in circular units. 
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Contents 
Number  Singular  Plural 

nominative  ārea  āreae 
genitive  āreae  āreārum 
dative  āreae  āreīs 
accusative  āream  āreās 
ablative  āreā  āreīs 
vocative  ārea  āreae 
Inflection for area  Singular  Plural  

common  Indefinite  Definite  Indefinite  Definite 
Base form  area  arean  areor  areorna 
Possessive form  areas  areans  areors  areornas 
This page uses content from the English language Wikipedia. The original content was at Area. The list of authors can be seen in the page history. As with this Familypedia wiki, the content of Wikipedia is available under the Creative Commons License. 
Wikipedia  Area + 
Area is the amount of space a two dimensional (flat) surface takes up. It is useful because it is how much of a material is needed to make a hollow container; for example, how much wood is needed to make a wardrobe.
You can use different formulas to find the area of different shapes.
The area of a flat object is related to the surface area and volume of a threedimensional object.
The area under a curve can be found using integration, from calculus.
Some units used to measure area are square mile and square kilometre.
Here are sentences from other pages on Area, which are similar to those in the above article.
