14.
∠BCE= 90 - ∠ACE = ∠CAD
△BEC ∽ △CDA
15.
(1)∵BD=DC
∴△BDG ≌ △CDF
∴BG = CF
(2)∵DG=DF
∴△DEF ≌ △DEG
EF =EG
BE CF EF的关系就等同于BE BG EG(△BEG的三边)
BE + CF > EF
14.
∠BCE= 90 - ∠ACE = ∠CAD
△BEC ∽ △CDA
15.
(1)∵BD=DC
∴△BDG ≌ △CDF
∴BG = CF
(2)∵DG=DF
∴△DEF ≌ △DEG
EF =EG
BE CF EF的关系就等同于BE BG EG(△BEG的三边)
BE + CF > EF