Obtain the equation of the circle whose centre is (4,5) and whose circ...
Given:
- Centre of the circle: (4, 5)
- Equation of the circle: x^2 + y^2 + 4x - 6y = 12
Step 1: Identify the coordinates of the center of the circle.
The given equation of the circle is in the general form (x - h)^2 + (y - k)^2 = r^2, where (h, k) represents the coordinates of the center and r represents the radius. Comparing this with the given equation, we can identify the center of the circle as (h, k) = (-2, 3).
Step 2: Find the radius of the circle.
To find the radius of the circle, we can use the formula r = √((x - h)^2 + (y - k)^2), where (x, y) represents any point on the circle. Since the center of the circle is (-2, 3), we can choose this point to calculate the radius. Plugging in the values, we get r = √((-2 - 4)^2 + (3 - 5)^2) = √(36 + 4) = √40 = 2√10.
Step 3: Write the equation of the circle.
Now that we have the center and radius of the circle, we can write the equation in the form (x - h)^2 + (y - k)^2 = r^2. Substituting the values, we get (x + 2)^2 + (y - 3)^2 = (2√10)^2 = 40.
Conclusion:
The equation of the circle with center (4, 5) and circumference passing through the center of the circle x^2 + y^2 + 4x - 6y = 12 is (x + 2)^2 + (y - 3)^2 = 40.
Obtain the equation of the circle whose centre is (4,5) and whose circ...