A circle is centered at \( D(-1,3) \). The point \( G(-10,1) \) is on the circle. Where does the point \( J(-3,12) \) lie?
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The radius of the circle can be determined by calculating the distance between the center \( D(-1,3) \) and the point \( G(-10,1) \). Using the distance formula: \[ r = \sqrt{(x_2 - x_1)^2 + (y_2 - y_1)^2} \] Substituting in the coordinates of \( D \) and \( G \): \[ r = \sqrt{(-10 - (-1))^2 + (1 - 3)^2} = \sqrt{(-9)^2 + (-2)^2} = \sqrt{81 + 4} = \sqrt{85} \] Now that we have the radius \( r = \sqrt{85} \), the equation of the circle can be expressed as: \[ (x + 1)^2 + (y - 3)^2 = 85 \] Next, we will check where the point \( J(-3,12) \) lies in relation to this circle by substituting \( J \)'s coordinates into the circle's equation: \[ (-3 + 1)^2 + (12 - 3)^2 = (-2)^2 + (9)^2 = 4 + 81 = 85 \] Since the left-hand side equals the radius squared (85), the point \( J(-3,12) \) lies on the circle!