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Set Theorymedium
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A circle has radius r=4r = 4r=4. If we define set CCC as the set of points (x,y)(x, y)(x,y) such that x2+y2≤16x^2 + y^2 \leq 16x2+y2≤16, and set SSS as the set of points (x,y)(x, y)(x,y) such that x2+y2=16x^2 + y^2 = 16x2+y2=16, which is true?

r=4