November 30th, 2015, 12:35 PM  #1 
Senior Member Joined: Nov 2013 Posts: 434 Thanks: 8  pentagon 
November 30th, 2015, 01:19 PM  #2 
Math Team Joined: Oct 2011 From: Ottawa Ontario, Canada Posts: 14,597 Thanks: 1038 
Found it! x is in between lines CD and FD, above point M.

December 2nd, 2015, 06:26 AM  #3 
Newbie Joined: Jul 2015 From: Austria Posts: 28 Thanks: 4 
We rotate triangle DGA about D by 36° and obtain triangle DHB, therefore x = 180°  36° = 144°.
Last edited by skipjack; December 2nd, 2015 at 07:09 AM. 

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