Metric conversion of lenght, mass, volume, temperature, area, density, pressure, energy, power, ...

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**Area** is defined in geometry is a two-dimensional measurement of the extent of a geometric shape or a part of a plane.

The unit of area is the unit square, a square the sides of which have length 1.

The surface of a solid shape can be calculated if there exists a function defining the side of the solid. The base unit of area is the square metre.