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23 votes
23 votes
4) Center: (3,7) Radius: 9

User Aaron Dunigan AtLee
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1 Answer

18 votes
18 votes

The equation of the circle with center (h,k) and radius r is:


(x-h)^2+(y-k)^2=r^2

In this case we have the following:


\begin{gathered} (h,k)=(3,7) \\ r=9 \\ \Rightarrow(x-3)^2+(y-7)^2=(9)^2 \end{gathered}

therefore, the equation of the circle with center (3,7) and radius 9 is:


(x-3)^2+(y-7)^2=81

User Dirk Hoekstra
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2.7k points