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Chongming Senior Three Mathematical Model II
(1)AB is greater than 2 for a quadrangular pyramid, so sadfe =12 (1+2) ×1= 32.

VB-ADFE= 13SADFE? AB= 1。

(2) If the midpoint H of AB is taken, HG∨AD, so ∠HGE is the angle formed by straight line EG and AD.

AG=5,EG=6,HG=2,EH=2。

Therefore, in Rt△EHG, tan ∠ egh = ehhg = 22.

That is, the angle between the straight line EF and AG is arctan22. ..