book Maths Puzzle Numerical Ability

Question; Decide whether of not the equations has a circle as its graph. If it does, give the center and the radius. #20. x^2-12x+y^2+20=0 Thank you so much for your help. Angela

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Ok, so I'm given 3 points of a parabola :(9,16) (0,12), and (27,0)..(9,16) is the vertex, (27,0) is an x-intercept, and (0,12) is the y-intercept. It can be inferred that (-9,0) is the measure of the complement of an angle is 20 degrees less than the measure of the angle.Find the number of degrees in the angle.