#### Sample Question

Which of the following is an equation of a circle in the center-radius form?

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Which of the following is an equation of a circle in the center-radius form?

- [%x^2+y^2-4x+10y+20=0%]
- [%(x+3)^2=-10(y-1)%]
- [%\displaystyle\frac{x^2}{4}+\frac{y^2}{1}=1%]
- [%(x-3)^2+(y+2)^2=81%]

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