Let the intersection of BD and AC be O and connect e O, and prove the judgment theorem that PB∑ plane AEC is parallel to the plane through a straight line; The second question, through AP= 1, AD radical number 3, triangular pyramid P-ABD volume V= radical number 3/4, we can find AB, making it the angles PB and H of AH⊥PB.
Solution: (1) Proof: Let the intersection of BD and AC be O and connect E O.
Abcd is a rectangle, ∴O is the midpoint of BD. This is the detailed answer/exercise/math /804043. Take a look. Detailed solution process and analysis. In a quadrangular pyramid P-ABCD, the bottom ABCD is a rectangle, the PA⊥ plane ABCD, and E is the midpoint of PD. (1) Proof: PB∑ plane AEC；; (2) Let AP= 1, AD= root number 3, and volume of triangular pyramid V P-ABD = root number 3/4. Find the distance from a to PBC plane.
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