Question 1151007
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It is with a great difficulty I can understand what is written in the post and what does the author mean 
and what does he (or she) want.


My first question is:


    When the post asks  "whether or not it is a function" , 

    to which object/subject does it relate : to the circle or to the relation ?


In other words, who is " it " in this question ?  - the circle or the relation ?
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As the problem is presented in this post, it deserves to be displayed 


on a special exposition/exhibition as an example on how a Math problem &nbsp;<U>SHOULD &nbsp;NOT</U> &nbsp;be formulated.



At such exposition/exhibition, &nbsp;it may win one of the first / (of the top) &nbsp;10 &nbsp;prizes.