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High marks are urgent: detailed explanation of mathematics (science) in Liaoning college entrance examination in 200811.14.16.
Analysis Because G is the midpoint of pb, the volume of p-gac is equal to that of b-gac.

At the bottom, regular hexagonal abcder

bh=abtan30 =ab

And bd=ab.

So dh=2bh.

So vd-gac=2vb-gac=2vp-gac.

Answer c

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