Posted by properties of triangle on Friday, January 28, 2011 at 12:36am.
The interior angle associated with the 120 degree exterior angle is its supplement: 60 degrees. With interior angles of 45 and 60 degrees, the third interior angle must be 180 - 105 = 75 degrees
See your first post.
Thanks drwls. I could not understand this post at all. :)
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