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Mathematics 13 Online
OpenStudy (anonymous):

Earthquakes release seismic waves that occur in concentric circles from the epicenter of the earthquake. Suppose a seismograph station determines the epicenter of an earthquake is located 9 kilometers from the station. If the epicenter is located at the origin, write the equation for the circular wave that passes through the station.

OpenStudy (anonymous):

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

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