Tangent to a Circle

Geometry Level 2

Let OO be the center of a circle Γ\Gamma, and PP be a point outside of circle Γ.\Gamma. PAPA is tangential to Γ\Gamma at AA, and POPO intersects Γ\Gamma at D.D. If PD=14PD = 14 and PA=42,PA = 42, what is the radius of Γ?\Gamma?

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