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Begin forwarded message:
From: "Brilliant" <notifications@brilliant.org>
Date: 14 December 2017 at 2:40:06 PM SGT
To: <changchengliang@gmail.com>
Subject: Chang, orange you glad we send you math puzzles?
Problems of the Week
December 11 - December 17
Basic Intermediate Advanced 
In the regular decagon above, find the percentage of area that is shaded orange.
Hint: You can solve this in your head with one quick trick!
Brilliant, 15 Butte Pl, San Francisco CA 94103
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