In a circle, chord $AB$ is extended to point $P$ outside the circle, and $PT$ is a tangent to the circle from $P$. If $PA = 9\text{ cm}$ and $AB = 7\text{ cm}$, what is the length of tangent $PT$?
Options:
- A: 12 cm
- B: 10 cm
- C: 9 cm
- D: 15 cm
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