Area is the number of square units needed to cover a region. The region can be any closed shape.
Area is commonly measured in units of square metres (m2), square decimetres (dm2) and square centimetres (cm2). These units of area are derived (or compound) units in the International System of Units (SI)
Note that although 1 m = 10 dm, 1 m2 = 100 dm2.