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October 14th, 2011, 08:11 PM  #1 
Newbie Joined: Oct 2011 Posts: 9 Thanks: 0  Parallelogram problem
ABCD is a parallelogram. It has an angle ADE which is equal to angle FBC. a) Explain why angle ODE is equal to angle OBF. b) Prove that the triangle ODE is equal to triangle OBF. c) Hence, prove that DE and BF are parallel.

October 14th, 2011, 09:41 PM  #2 
Global Moderator Joined: Dec 2006 Posts: 18,544 Thanks: 1476 
Can prior knowledge of the alternate interior angle theorem and its converse be assumed?

October 14th, 2011, 10:09 PM  #3 
Newbie Joined: Oct 2011 Posts: 9 Thanks: 0  Re: Parallelogram problem
Didn't see that.


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