Explain why a point in the polar plane cannot be named by a unique ordered

pair (r, theta).

 you can describe any point but you can describe the same point in potentially infinite ways. 
example; the rectangular coordinate of (1,1) 

in polar you can describe this point as (pi/4,1) or (5pi/4, -1) and so on

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Ithink ghe answer to this question is b just trying to others