solve 1<x^2+y^2 <=2 why this set is contitutes nor open regn nor closed region

points x y in the xy plane
in Other Math Topics by Level 1 User (780 points)

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1 Answer

1< (x^2+y^2) <=2 is a ring

points outside serkel with raius=1 & inside serkel with radius=sqrt(2)
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