The relationship between EF and be can be obtained by taking m as a 30 ° angle, intersection AB with E, intersection CA extension line with F

The relationship between EF and be can be obtained by taking m as a 30 ° angle, intersection AB with E, intersection CA extension line with F

CG ‖ AB intersects EF with G through point C
∵ AB = AC, ∵ ABC is isosceles △
∠B=∠BCA=75º
M is the midpoint of BC, which is easy to be proved as △ BME ≌ △ CMG
∠B=∠CGM=75º
∠CFG=75-30=45
∠CGF=180-75=105
∠CGF>∠CFG
CF>CG=BE