Section Euclid.
Context `{Ax:euclidean_neutral_ruler_compass}.

Lemma lemma_interior5 :
forall A B C D a b c d,
BetS A B C -> BetS a b c -> Cong A B a b -> Cong B C b c -> Cong A D a d -> Cong C D c d ->
Cong B D b d.