Given,
AD is a median of △ABC. Thus, it will divide △ABC into two triangles of equal area.
∴area(ABD)=aear(ACD) --- (i)
Also,
ED is the median of △ABC.
∴area(EBD)=area(ECD) --- (ii)
Subtracting (ii) from (i),
area(ABD)−area(EBD)=area(ACD)−area(ECD)
⇒area(ABE)=area(ACE) [henceproved]