(1)
∵AB=AC,BD=DC,AD=AD
∴△ABD≌△ACD
∴∠BAD=∠CAD
AD为∠BAC的平分线
又∵ DE⊥AB,DF⊥AC
∴DE=DF
(2)
∵AB=AC,BD=DC,AD=AD
∴△ABD≌△ACD
∴∠BAD=∠CAD
AD为∠BAC的平分线
又∵ G在AD上,GE⊥AB,GF⊥AC
∴GE=GF
(1)
∵AB=AC,BD=DC,AD=AD
∴△ABD≌△ACD
∴∠BAD=∠CAD
AD为∠BAC的平分线
又∵ DE⊥AB,DF⊥AC
∴DE=DF
(2)
∵AB=AC,BD=DC,AD=AD
∴△ABD≌△ACD
∴∠BAD=∠CAD
AD为∠BAC的平分线
又∵ G在AD上,GE⊥AB,GF⊥AC
∴GE=GF