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July 5th, 2016, 08:42 PM  #11  
Senior Member Joined: May 2016 From: USA Posts: 1,310 Thanks: 551  Quote:
The sum of the interior angles of a pentagon is 180(5  2) = 540 degrees. So each of the 5 interior angles is 108 degrees. We can decompose a regular pentagon into 10 congruent right triangles thereby splitting each angle of 108 into two equal angles of 54 degrees.  
July 6th, 2016, 05:30 AM  #12 
Math Team Joined: Oct 2011 From: Ottawa Ontario, Canada Posts: 14,412 Thanks: 1024 
Ski, something a bit different; try this: an isosceles triangle, equal sides = 1, vertex = 1 degree. Calculate area. Multiply area by 360. 
July 8th, 2016, 07:55 AM  #13 
Newbie Joined: Aug 2009 Posts: 12 Thanks: 0 
I see thanks Jeff and Denis


Tags 
area, circle, finding, inside, square 
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