Question 417401
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Hi
Standard Form of an Equation of a Circle is {{{(x-h)^2 + (y-k)^2 = r^2}}}
where Pt(h,k) is the center and r is the radius
circle with a radius of 9 units and center at(–4, 2)
 (x+4)^2 +(y-2)^2 = 81
{{{drawing(300,300,   -20,20,-20,20,  grid(1),
circle(-4, 2,0.8),
circle(-4, 2,9),
graph( 300, 300, -20,20,-20,20))}}}