From a square sheet of uniform density, one of the four portions within its diagonals is removed .. Find the of centre of mass of a remaining portion if the side of the square is a. The portion removed is right one

Lets find out the com of the triangle first.
Let the density be ρ
The center of the squre is taken as the origin
The x coordinate of the CoM is
Now using symmetry ycm=0
Similarly, the coordinates of the other three triangles are (-a/3,0), (0,a/3),(0,-a/3)
So the CoM of the remaining square is

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