How to make a rotation on the graph coordinate plane

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I'm having trouble trying to rotate my point on the graph could someone help explain how to do it in an easy way? much appreciated. 

May 3rd, 2015

suppose your point is (X, Y)

in first coordinate = (X, Y)

Second   Coordinate = (-X ,Y)

Third coordinate  =   (-X ,-Y)

fourth coordinate  = ( X ,-Y)

  suppose x =1 and Y=2 

 then the point will be from first to fourth coordinate 

(1,2) , (-1,2) , (-1,-2) , (1, -2)  respectively.

I hope it will be helpful 

Regarding any clarification plz let me know .I will try to explane      

May 3rd, 2015

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May 3rd, 2015
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May 3rd, 2015
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