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−  What can be a description of the set of solutions for this: <math>x^{2}+y^{2}=2x+2y</math>?
 
   
−  <math>\textbf{(A)}</math> Two overlapping circles with each area <math>2\pi</math>.
 
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−  <math>\textbf{(B)}</math> Four not overlapping circles with each area <math>4\pi</math>.
 
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−  <math>\textbf{(C)}</math> There are two overlapping circles on the right of the <math>y</math>axis with each area <math>2\pi</math> and the intersection area of two overlapping circles on the left of the <math>y</math>axis with each area <math>2\pi</math>.
 
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−  <math>\textbf{(D)}</math> Four overlapping circles with each area <math>4\pi</math>.
 
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−  <math>\textbf{(E)}</math> There are two overlapping circles on the right of the <math>y</math>axis with each area <math>4\pi</math> and the intersection area of two overlapping circles on the left of the <math>y</math>axis with each area <math>4\pi</math>.
 