Chord in a Circle

Geometry Level 4

\(\Gamma\) is a circle with chord \(AB\). \(P\) is a point outside of \(\Gamma\) such that \(PA\) is tangent to \(\Gamma\) and \(\angle BPA = 90^\circ\). If \(AB = 48\) and \(PB = 8\), what is the radius of \(\Gamma\)?

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