Respuesta :

ktreyb
The equation of a circle is:

(x - h)² + (y - k)² = radius²
where (h, k) is the center. 

Assuming your center is (9, 7) your equation is:
(x - 9)² + (y - 7)² = 144

Assuming your center is (9, - 7) your equation is:
(x - 9)² + (y + 7)² = 144

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