proofs will parallel lines

msimard8

I need to prove that <acb is equal to one of the other interior angles of triangle abc.

help when pic uploads

HallsofIvy

What do you know about the size of an exterior angle relative to the size of the other two angles in the interior?
If CZ, the bisector of that angle, is parallel to AB, what does that tell you about angles BAC and ACZ?

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msimard8	proofs will parallel lines Tweet I need to prove that <acb is equal to one of the other interior angles of triangle abc. help when pic uploads Attached Thumbnails

HallsofIvy Recognitions: Gold Member Science Advisor Staff Emeritus	What do you know about the size of an exterior angle relative to the size of the other two angles in the interior? If CZ, the bisector of that angle, is parallel to AB, what does that tell you about angles BAC and ACZ?