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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?

Ask by Young Bernard. in the United States
Jan 21,2025

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Tutor-Verified Answer

Answer

The point \( J(-3,12) \) lies on the circle centered at \( D(-1,3) \) and passing through \( G(-10,1) \).

Solution

To determine where the point \( J(-3,12) \) lies in relation to the circle centered at \( D(-1,3) \) and passing through the point \( G(-10,1) \), we need to find the equation of the circle first. The general equation of a circle with center \( (h, k) \) and radius \( r \) is given by: \[ (x - h)^2 + (y - k)^2 = r^2 \] Given that the circle is centered at \( D(-1,3) \), the equation of the circle is: \[ (x + 1)^2 + (y - 3)^2 = r^2 \] We also know that the point \( G(-10,1) \) lies on the circle, so we can substitute the coordinates of \( G \) into the equation to find the radius \( r \): \[ (-10 + 1)^2 + (1 - 3)^2 = r^2 \] \[ (-9)^2 + (-2)^2 = r^2 \] \[ 81 + 4 = r^2 \] \[ r^2 = 85 \] Therefore, the equation of the circle is: \[ (x + 1)^2 + (y - 3)^2 = 85 \] Now, we need to determine where the point \( J(-3,12) \) lies in relation to this circle. We can substitute the coordinates of \( J \) into the equation of the circle to see if it satisfies the equation. Evaluate the expression by following steps: - step0: Evaluate: \(\left(x+1\right)^{2}+\left(y-3\right)^{2}=85\) - step1: Substitute: \(\left(-3+1\right)^{2}+\left(12-3\right)^{2}=85\) - step2: Add the numbers: \(\left(-2\right)^{2}+\left(12-3\right)^{2}=85\) - step3: Subtract the numbers: \(\left(-2\right)^{2}+9^{2}=85\) - step4: Add the numbers: \(85=85\) - step5: Check the equality: \(\textrm{true}\) The point \( J(-3,12) \) lies on the circle centered at \( D(-1,3) \) and passing through the point \( G(-10,1) \).

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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!

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