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Gaokao Math Practice Question

10.已知 $F$ 是双曲线 $C: \frac{x^{2}}{4}-\frac{y^{2}}{5}=1$ 的一个焦点, 点 $P$ 在 $C$ 上, $O$ 为坐标原点, 若 $|O P|=|O F|$, 则 $\triangle O P F$ 的面积为 $($ )

  1. A.$\frac{3}{2}$
  2. B.$\frac{5}{2}$
  3. C.$\frac{7}{2}$
  4. D.$\frac{9}{2}$

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