In $\Delta PQR$,$m \angle Q = 90^{\circ}$ and $\overline{QM}$ is an altitude to the hypotenuse $PR$. If $QR = 9$ and $PR = 13.5$,find $RM$.

  • A
    $5$
  • B
    $8$
  • C
    $6$
  • D
    $20$

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