Here is a parallelogram:

 

 

 

Argue that diagonal AD and diagonal CB bisect each other at point E.

 

  1. If AD and CB bisect each other at point E, what must that mean about the lengths of segments AE and ED?  About segments CE and EB?

 

 

 

  1. What are some things you already know about parallelograms?

 

 

 

c.  Now proceed with your argumentÉ