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help please!!! Geometry!
How do i do this?!
Equations of Circles
Find the equation of the circle with the given center and radius.
C(0, 0), r = 4
A) (x + 4)2 + (y + 4)2 = 4
B) x2 + y2 = 4
C) x2 + y2 = 16
D) (x  2)2 + (y  2)2 = 16
 2 years ago
 2 years ago
help please!!! Geometry! How do i do this?! Equations of Circles Find the equation of the circle with the given center and radius. C(0, 0), r = 4 A) (x + 4)2 + (y + 4)2 = 4 B) x2 + y2 = 4 C) x2 + y2 = 16 D) (x  2)2 + (y  2)2 = 16
 2 years ago
 2 years ago

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Fools101Best ResponseYou've already chosen the best response.0
thank u but how did u get that answer? Find the equation of the circle with the given center and radius. C(2, 1); r = 3 A) (x + 2)2 + (y  1)2 = 3 B) (x  2)2 + (y + 1)2 = 9 C) (x + 2)2 + (y  1)2 = 9 D) (x  2)2 + (y + 1)2 = 3
 2 years ago

RinglumBest ResponseYou've already chosen the best response.0
The equation of a circle is (xxc)^2 + (yyc)^2 = r^2 where (xc,yc) are the coordinates of the center and r is the radius. Replace to verify that it is C
 2 years ago

satellite73Best ResponseYou've already chosen the best response.0
\[(xh)^2+(yk)^2=r^2\] is general equation for circle with center (h,k) radius r
 2 years ago

satellite73Best ResponseYou've already chosen the best response.0
in your case you have \[h=2,k=1,r=9\] so you get \[(x2)^2+(y+1)^2=9\]
 2 years ago

satellite73Best ResponseYou've already chosen the best response.0
sorry i meant \[h=2,k=1,r=3\]
 2 years ago

Fools101Best ResponseYou've already chosen the best response.0
I get a little thank u...
 2 years ago
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