# Tangent to a Circle

Geometry Level 2

Let $O$ be the center of a circle $\Gamma$, and $P$ be a point outside of circle $\Gamma.$ $PA$ is tangential to $\Gamma$ at $A$, and $PO$ intersects $\Gamma$ at $D.$ If $PD = 14$ and $PA = 42,$ what is the radius of $\Gamma?$

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