area
Area is a quantity expressing the two-dimensional size of a defined part of a surface, typically a region bounded by a closed curve. The term surface area refers to the total area of the exposed surface of a 3-dimensional solid, such as the sum of the areas of the exposed sides of a polyhedron.
Units
Units for measuring surface area include:
 Metric
:square metre (m²) = SI derived unit
:are (a) = 10 square metres (m²)
:hectare (ha) = 10 square metres (m²)
:square kilometre (km²) = 10 square metres (m²)
:square megametre (Mm²) = 1012 square metres
:square foot = 144 square inches = 0.09290304 square metres (m²)
:square yard = = 0.83612736 square metres (m²)
:square perch = 30.25 square yards = 25.2928526 square metres (m²)
:acre = 10 square chains or 160 square perches or 4 square yards or = 4046.8564224 square metres (m²)
:square mile = = 2.5899881103 square kilometres (km²)
Useful formulas
All of the above calculations show how to find the area of many shapes.
The area of irregular polygons can be calculated using the "Surveyor's formula".[http://www.maa.org/pubs/Calc_articles/ma063.pdf]
See also
Equi-areal mapping
Integral
Orders of magnitude (area)—A list of areas by size.
Volume
External links
Area formulas
Conversion cable diameter to circle cross-sectional area and vice versa
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