Find the radius of the circle that has its center at (0,-4) and passes through ( square root of 13, 2)

Let O0,-4 be the centre of circle and A13,2 be a point on the circle.Now, radius, OA = 13-02 + 2+42 OA = 13 + 36OA = 49OA = 7 unitsSo, radius of circle = 7 units

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