Draw a straight line from opposite corners. Where the lines cross is the centre.
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In both cases, because of their symmetry, the center of gravity is in the geometric center.
centre it and that is the answer
You either need to find the area of the triangle and subtract it from that of the rectangle OR you find the areas of the bits of the rectangle that are outside the triangle and add them together. Without more details of the triangle, it is not possible to give a more detailed answer.
Just draw the two diagonals of the rectangle,the point of intersection you will get5,is the centre of gravityof rectangle
In the center, behind the rim.