find the center and radius of a. 9x^2+9y^2=0 b.x^2/4 + y^2/4=1
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Part a looks wrong. If it's supposed to be 9x*2+9y^2=1, radius=1/3 and centre is (0,0).

b. Radius of circle is 2 because x^2+y^2=4=r^2. Centre is (0,0).
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