March 17th, 2017, 07:29 AM  #1 
Member Joined: May 2016 From: Ireland Posts: 94 Thanks: 1  circle proof
I'm trying to use angles on the same arc theorem.
Last edited by skipjack; March 17th, 2017 at 01:04 PM. 
March 17th, 2017, 01:03 PM  #2 
Global Moderator Joined: Dec 2006 Posts: 17,172 Thanks: 1285 
By the exterior angle theorem, angle LAC = angle ALB + angle ADB. Also, angle ALB = angle ACB. 

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