Size of a surface. It is measured in square units, usually square centimetres (cm
2), square metres (m
2), or square kilometres (km
2).
Surface area is the area of the outer surface of a solid.
Integration may be used to determine the area of shapes enclosed by curves.
The areas of
two-dimensional (2D) shapes with straight edges are determined using the area of a rectangle. For example, the area of a parallelogram is found by taking a triangle from one end and moving it to the other, forming a rectangle.
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