H
E
E
L
E
M
E
N
T
S
EF has been drawn parallel to BC, one of the sides of traingle ABC,
proportionally,
as BE is to EA,
so is CF to FA. [VI.2]
Again, since
FG has been drawn parallel to CD, one of the sides of traingle ACD,
proportionally,
as CF is to FA,
so is DG to GA. [VI.2]
