Definition: Parallelogram - Defining Property III

If both diagonals of a quadrilateral bisect the quadrilateral, it is a parallelogram.


Thank you to the contributors under CC BY-SA 4.0!

Github:
bookofproofs
non-Github:
@Calahan
@Casey


References

Adapted from CC BY-SA 3.0 Sources:

  1. Callahan, Daniel: "Euclid’s 'Elements' Redux" 2014

Adapted from (Public Domain)

  1. Casey, John: "The First Six Books of the Elements of Euclid"