Write the equation of the circle with center: ( − 3 , − 6 ) and radius: 3.
The equation of a circle is (x  h)² + (y  k)² = r²
(h,k) are the coordinates of the center of the circle r is the radius of the circle Substitute 3 in for h, 6 in for k, and 3 in for r. (x  h)² + (y  k)² = r² {the equation of a circle} [x  (3)]² + [y  (6)]² = 3² {substituted in for h, k, and r} (x + 3)² + (y + 6)² = 9 {simplified the negative signs} Ask Algebra House
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