Question 1093168
Suppose one vertex angle of a regular octagon is trisected as shown in the figure.  Each side of the octagon measures 4 units.  Find the area of the shaded region. I put the site to the picture down below. Thank you.
http://msmcclure.com/wp-content/uploads/2013/09/p115.gif
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Find the white areas, subtract that from the area of the octagon.