Answer to Question #290030 in Analytic Geometry for grace

Question #290030

Find the standard of the circle which has a circle at ( 15, -20), radius 9.

Expert's answer

"(15,-20), r=9\\\\\n(x-x_0)^2+(y-y_0)^2=r^2\\\\\n(x-15)^2+(y+20)^2=9^2\\\\\n(x-15)^2+(y+20)^2=81"

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