Which is an equation of the circle with a radius of 9 units and center at
(–4, 2)?
(x − 9)2 + (y + 4)2 = 4
(x − 4)2 + (y + 2)2 = 81
(x + 4)2 + (y − 2)2 = 81
(x − 2)2 + (y + 4)2 = 81
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OpenStudy (anonymous):
@Teddyiswatshecallsme do you know this?
OpenStudy (anonymous):
Equation of a circle:
\[(x - h)^2 + (y - k)^2 = r^2\]
OpenStudy (anonymous):
h and k represent the x and y coordinates of the center of the circle
OpenStudy (anonymous):
r represents the radius
OpenStudy (anonymous):
The center is (–4, 2) and h represents -4 and k represents 2. 9 is the radius of the circle and we have to square that = 81.
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OpenStudy (anonymous):
okay that makes sense. i just googled it after awhile
OpenStudy (anonymous):
Okay so now plug those values into the original formula of the circle
OpenStudy (anonymous):
(x+4)^2 +(y-2)^2 = 81
OpenStudy (anonymous):
Correct :)
OpenStudy (anonymous):
So what answer should that be?
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