Solutions:

The equation of the circle is \( (x – 0)^2 + (y – 0)^2 = 16\) where the center of the circle is \((0,0)\) and the radius of 4 squared is 16.

One point is at \((1, d)\) . Substituting 1 in for x, the equation is \((-1)2 + y^2 = 16\) \(y^2 = 15\) or \(y = \sqrt{15}\)

The point is \((1,\sqrt{15})\)

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