H
E
E
L
E
M
E
N
T
S
therefore
the two sidees ED, DF are equal to the two sides GD, DF;
and
the angle EDF is equal to the angle GCF;
therefore
the base EF is equal to the base GF,
and
the triangle DEF is equal to the triangle DGF,
and
and the remaining angles will be equal to the remaining angles, namely those which the equal sides subtend. [I.4]
