过点A做BC的垂线,垂足为M
∵AB=AC
∴∠CAM=∠BAC/2
∵AE=AF
∴∠E=∠AFE,∠EAF=180-2∠AFE
∴∠CAM=∠BAC/2
=(180-∠EAF)/2
=(180-(180-2∠AFE))/2
=∠AFE
∴EF∥AM
∴EF垂直BC
过点A做BC的垂线,垂足为M
∵AB=AC
∴∠CAM=∠BAC/2
∵AE=AF
∴∠E=∠AFE,∠EAF=180-2∠AFE
∴∠CAM=∠BAC/2
=(180-∠EAF)/2
=(180-(180-2∠AFE))/2
=∠AFE
∴EF∥AM
∴EF垂直BC