Find the equation of a circle concentric with the circle x^2 + y^2 – 6x + 12y + 15 = 0 and has double of its area.
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it's centre is C(3,-6).
and the radius is √(9+36-15)=√30
so the equation if circle is (x-3)^2+(y+6)^2=30
and the radius is √(9+36-15)=√30
so the equation if circle is (x-3)^2+(y+6)^2=30
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