Based on typical available centroid information, what are the minimum number of pieces to consider for determining the centroid of the area shown below?       1     2     3     4

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Center of Gravity and Centroid

The term center of gravity indicates the position or location of a point about which the whole weight of a body or system is supposed to be concentrated, which means the whole weight of the body or system works through this point. It is closely related to mass distribution. For all positions of the body, the center of gravity would be a single point.