Centre and radius of the circle given by a modulus equation in z

1. A.
   $C\equiv(3,0), r=4$
2. B.
   $C\equiv(6,0), r=2$
3. C.
   $C\equiv(0,3), r=8$
4. D.
   $C\equiv(0,0), r=2\sqrt{2}$

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1. A.
   X-axis.
2. B.
   circle with centre $(1,0)$ and radius 1 unit.
3. C.
   circle with centre $(-1,0)$ and radius 1 unit.
4. D.
   Y-axis.

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1. A.
   circle with center $(2,0)$ and radius $\sqrt{3}$
2. B.
   circle with center $(0,2)$ and radius $\sqrt{3}$
3. C.
   circle with center $(0,0)$ and radius $\sqrt{3}$
4. D.
   circle with center $(0, - 2)$ and radius $\sqrt{3}$

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