Mathematics · Coordinate Geometry

Let θ be the angle between the circles S ≡ x2 + y2 + 2x - 2y + c = 0 and S1 ≡ x2 + y2 - 6x - 8y + 9 = 0. If c is an integer and cos(θ) = 516, then the radius of the circle S = 0 is:

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