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\(ABCDEFGHIJ\) is a regular decagon. The rotation centered at \(G\) with an angle of alpha takes \(D\) to \(J \). Given that alpha is less than 180 degrees, find alpha. 

 

Thank you!

I don't know why the latex isn't working.

 Aug 25, 2020
 #1
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alpha = 84 degrees.

 Aug 25, 2020
 #2
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I am not sure about the process, could you share some of your thought process? Thanks!

Noori  Aug 25, 2020
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As follows:

 Aug 25, 2020
edited by Alan  Aug 25, 2020
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Thank you so much! I get the answer now.

Noori  Aug 25, 2020

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