How to calculate area of irregular shape in autocad? area of multiple objects?

How to calculate area of irregular shape in autocad? How to calculate the area of multiple objects? It is easy to calculate the area of simple object, such as circle or rectangle. But when come to a complex object, AREA command doesn't work. How to calculate the area of a irregular shape of 2D geometric object? 

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How to calculate area of irregular shape in autocad? area of multiple objects?

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