Posted by Sharon on Monday, October 3, 2011 at 9:35pm.
△ABC ; Ray CE bisects exterior angle BCD ; Ray CDLine AB

geometry  Steve, Tuesday, October 4, 2011 at 8:52am
line CE and AB are cut by transversal AB, with corresponding angles equal.
SInce CE bisects BCD, ECD = BCE = BAC.
CD is just an extension of AB, so is parallel
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