Definition 11
Similar segments of circles are those which admit equal angles, or in which the angles equal one another.
![Guide](../guide.gif)
Since the segments BGC and EHF have in them equal angles BGC and EHF, this definition declares them to be similar segments.
This is hardly a proper definition considering that proposition III.21 has yet to be proved in which it is shown that all the angles in one segment are equal.
Book III Introduction -
Definition III.10 -
Proposition III.1.
© 1996
D.E.Joyce
Clark University