# Area Converter

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Area can be defined through the use of axioms, defining it as a function of a collection of certain plane figures to the set of real numbers. It can be proved that such a function exists. 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 measured 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.[11] 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. In non-metric units, the conversion between two square units is the square of the conversion between the corresponding length units.
1 foot = 12 inches, the relationship between square feet and square inches is
1 square foot = 144 square inches,
where 144 = 122 = 12 × 12. Similarly:
1 square yard = 9 square feet
1 square mile = 3,097,600 square yards = 27,878,400 square feet
1 square inch = 6.4516 square centimetres
1 square foot = 0.09290304 square metres
1 square yard = 0.83612736 square metres
1 square mile = 2.589988110336 square kilometres

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