Section Euclid.
Context `{Ax:area}.

Lemma proposition_48 :
forall A B C D E F G H K L M,
Triangle A B C -> SQ A B F G -> SQ A C K H -> SQ B C E D -> BetS B M C -> BetS E L D -> EF A B F G B M L D -> EF A C K H M C E L -> RE M C E L ->
Per B A C.