$\"\"$

Draw the diagram :

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Observe the diagram:

The centroids of the regions are $\"\"$ , $\"\"$ and $\"\"$ .

Mass of the rectangle region is area of therectangle, $\"\"$ .

The center of mass is $\"\"$ .

$\"\"$

The center of the mass is $\"\"$ .

$\"\"$

The center of mass is $\"\"$ .