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March 17th, 2017, 07:29 AM   #1
Joined: May 2016
From: Ireland

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circle proof

I'm trying to use angles on the same arc theorem.
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Last edited by skipjack; March 17th, 2017 at 01:04 PM.
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March 17th, 2017, 01:03 PM   #2
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By the exterior angle theorem, angle LAC = angle ALB + angle ADB.
Also, angle ALB = angle ACB.
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circle, proof

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