If FG⊥AC passes through point F in △PAC, then FG⊥ surface ABCD.
FG/PA = CF/CP = CF/(CF+FP)= 1/8
FG= 1/8PA
And FG vertical plane ABCD,
Then FG is the height of the triangular pyramid F-BCD.
What are the "One" kindergarten classes?
Children's situation analysis and measures: 1. In teaching, the key point is to cultivate children's interest and hob