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. Area is an important invariant in the differential geometry of surfaces.
Units[edit | edit source]
Units for measuring area include:
- are (a) = 100 square meters (m²)
- hectare (ha) = 100 ares (a) = 10000 square meters (m²)
- square kilometre (km²) = 100 hectars (ha) = 10000 ares (a) = 1000000 square metres (m²)
- square megametre (Mm²) = 10^{12} square metres
- square foot = 144 square inches = 0.09290304 square metres (m²)
- square yard = 9 square feet (0.84 m^{2}) = 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 4840 square yards or 43,560 square feet (4,047 m^{2}) = 4046.8564224 square metres (m²)
- square mile = 640 acres (2.59 km^{2}) = 2.5899881103 squarea kilometers (km²)
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