A paper on the laws of edges and angles corresponding to congruent triangles. Please come in and help me if you know. Would you?
AB//ED-& gt； Angle ABE= angle DEB
AC//FD-& gt； Angle ACB= angle DFE
FC is the male edge.
BF=CE
BF+FC=EC+FC
Use'
Corner corner
Prove that he is equal.