Traditional Culture Encyclopedia - Traditional culture - How to do the second problem of solid geometry with traditional methods
How to do the second problem of solid geometry with traditional methods
Let me give you a general idea. In ABB 1A 1 plane, the intersection point a is perpendicular to A 1B, the vertical foot is o, AO is perpendicular to A 1B, and AD is perpendicular to A 1B, so the plane formed by AO and AD is perpendicular to a1b.
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