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Write the euation of a circle with center at (0,-9) and radius 15

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I need to find the equation of a circle. Write the euation of a circle with center at (0,-9) and radius 15

asked Feb 22, 2014 in ALGEBRA 1 by chrisgirl Apprentice

1 Answer

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Circle equation is (x-h)^2+(y-k)^2 = r^2

Given (h,k) = (0,-9) and r = 15

(x-0)^2+(y+9)^2 = 15^2

x^2+y^2+81+18y = 225

Subtract 225 from each side.

Required circle equation is x^2+y^2+18y-144 = 0.

answered Feb 22, 2014 by ashokavf Scholar

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