Require Export D6_SumAnglesProp.
Require Export Omega.
Section DISTINCT_PARALLEL.

Lemma SecantParallelogrammSecant : forall A B : Point, forall F F' : Figure, forall D : Line F, forall D' : Line F',
Parallelogramm (LineA F D) (LineB F D) A B ->
F' A ->
~F' B ->
SecantLines F F' D D'.