Since the center is at the origin, (h,k) = (0,0); This means that the left side of the equation is x^2 + y^2
The radius is going to be the distance from (0,0) to (2,-6). We use the distance formula:
sqrt[(2-0)^2 + (-6-0)^2] = sqrt[4 + 36]. So the radius is sqrt 40. r^2 = 40.
Hope this helps.
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