SOLUTION: I didnt get how to write an equationin in this problem; Write an equation of a circle with center at the origin and radiu 6. Could someone help me with this??

Question 206847: I didnt get how to write an equationin in this problem; Write an equation of a circle with center at the origin and radiu 6.
Could someone help me with this??
Found 3 solutions by stanbon, Alan3354, scott8148:
Answer by stanbon(48535)   (Show Source):
You can put this solution on YOUR website!
I didnt get how to write an equationin in this problem; Write an equation of a circle with center at the origin and radiu 6.
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If center is at (0,0) and radius is "r", the equation is
x^2 + y^2 = r^2
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Since r = 6 you get:
x^2 + y^2 = 36
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Cheers,
Stan H.

Answer by Alan3354(21583)   (Show Source):
You can put this solution on YOUR website!
Standard circle eqn is
(x-h)^2 + y-k)^2 = r^2
(h,k) is the center, for this problem they're both 0.
--> x^2 + y^2 = 36

Answer by scott8148(5880)   (Show Source):
You can put this solution on YOUR website!
the general equation for a circle centered at (h,k) with a radius of r is (x-h)^2 + (y-k)^2 = r^2

in this case, h and k are both zero (at the origin)
___ so the equation is x^2 + y^2 = 36