|Book IV Proposition 3|
It was proved that the angle LMN is equal to the angle DEF and the angle LNM
to the angle DFE; therefore
the remaining angle MLN is equal to the angle EDF. [I.32]
the triangle LMN is equiangular with the triangle DEF;
is has been circumscribed about the circle ABC.
Being what it was required to do.
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