Gaokao Math Practice Question
在正方体 $A B C D-A_{1} B_{1} C_{1} D_{1}$ 中, $P$ 为 $B_{1} D_{1}$ 的中点, 则直线 $P B$ 与 $A D_{1}$ 所成的角为 ($\qquad$)
- A.$\frac{\pi}{2}$
- B.$\frac{\pi}{3}$
- C.$\frac{\pi}{4}$
- D.$\frac{\pi}{6}$
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