|Book IV Proposition 12|
I say next that it is also equiangular.|
the angle FKC is equal to the angle FLC,
the angle HKL was proved double of the angle FKC,
the angle KLM double of the angle FLC,
the angle HKL is also equal to the angle KLM.
each of the angles KHG, HGM, GML can also be proved equal to each of the angles HKL, KLM;
the five angles GHK, HKL, KLM, LMG, MGH are equal to one another.
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