Require Export GeoCoq.Elements.OriginalProofs.lemma_triangletoparallelogram.
Require Export GeoCoq.Elements.OriginalProofs.lemma_PGrotate.
Require Export GeoCoq.Elements.OriginalProofs.proposition_35.
Section Euclid.
Context `{Ax:area}.

Lemma proposition_37 :
forall A B C D,
Par A D B C ->
ET A B C D B C.