I had a Theorem
A short story by Michael Chirico
Theorem 6-1
Theorem 6-2
*Opposite angles of a parallelogram are congruent
Theorem 6-3
*Opposite angles of a parallelogram are congruent
Theorem 6-4
If three (or more) parallel lines cut off congruent segments on one transversal, then they cut off congruent segments on every transversal.