Then, since
the circumferences BC, CK, KL are equal to one another,
the angles BGC, CGK, KGL are also equal to one another; [III.27]
therefore
whatever multiple the circumference BL is of BC,
that multiple also is the angle BGL of the angle BGC.
For the same reason also,
whatever multiple the circumference NE is of EF,
thet multiple also is the angle NHE of the angle EHF.
If the circumference BL is equal to the circumference EN,
the angle BGL is also equal to the angle EHN; [III.27]
if the circumference BL is greater than the circumference EN,
the angle BGL is also greater than the angle EHN ;
and
if less, less.

