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Ckaranja
The general equation of a circle is given by;
[tex] (x-a)^{2}+ (y-b)^{2} = r^{2} [/tex]
Where (a, b) is the centre of the circle and r is the radius. 
For the given circle, centre is (0,0) and r=11
[tex] (x-0)^{2} + (y-0)^{2} = 11^{2} [/tex]
[tex] x^{2} + y^{2} = 11^{2} [/tex]
taskmasters
The general equation of a circle is expressed as:

(x-a)^2+ (y-b)^2  = r^2

Where the point (a, b) is the center of the circle and r is the radius. 
For the given circle, center is (0,0) and r=11

Therefore, the equation of the circle would be:
(x)^2+ (y)^2 = 11^2
(x)^2+ (y)^2 = 121

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