Hi,

Standard Form of an Equation of a Circle is  

where Pt(h,k) is the center and r is the radius

9x^2+9^y2-441 = 0  |Note the use of ^ (upper case 6)

9x^2+9y^2 = 441    |dividing each term on both sides of the EQ by 9

    r = 7 

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