Posted by **Anonymous** on Saturday, January 16, 2010 at 11:58am.

Let I denote the interval [0,oo). For each r ∈ I, define

A={(x,y)∈ RxR:x^2+y^2=r^2}

B={(x,y)∈ RxR:x^2+y^2<=r^2}

C={(x,y)∈ RxR:x^2+y^2<r^2}

Determine

UA and ∩A

UB and ∩B

UC and ∩C

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