Traditional Culture Encyclopedia - Photography and portraiture - The flip problem of solid geometry in senior high school

The flip problem of solid geometry in senior high school

AC= root sign (AB? 0? 5+ years BC? 0? 5)=4 If BE⊥AC is E in the plane ABC and DF⊥AC is F in the plane BCD, then DF=AD*BC/AC= radical number 3 If FG is parallel to BE and BC is in G, then DFG = 120 and DH⊥FG is in the plane DFG.