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[几何] 2020年上海卷第15题 正方体中确定点的位置

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isee posted 2020-7-17 21:11 |Read mode
Last edited by isee 2020-7-17 21:502020年上海卷第15题

在棱长为$10$的正方体$ABCD-A_1B_1C_1D_1$中,$P$为左侧面$ADD_1A_1$上一点,已知点$P$到$A_1D_1$的距离为$3$,点$P$到$AA_1$的距离为$2$,则过点$P$且与$A_1C$平行的直线交正方体于$P$、$Q$两点,则$Q$点所在的平面是(     )
A.  $AA_1B_1B$
B.  $BB_1C_1C$
C.  $CC_1D_1D$
D.  $ABCD$



选D,平移线段$A_1P$即知,另,可以空间向量写么?

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