Tangents and the Radius!

Geometry Level 1

The diagrams shows a circle with radius \(r\) with a straight line tangent to the circle, the straight line passes through the point \(A \) and \(B\). Given that \(C\) is on the point of \(C\). And the distances \(\overline{AC} = 4, \overline{BC} = 3, \overline{AB} = 5 \). Find the radius of the circle.

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