120 degrees = 2X60....supplemental total = 180
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1st angle = 30 degrees 2nd angle = 60 degrees
one angle will be 69 degrees while the other angle will be 111 degrees.
60
A+b=180 x+2x=180 3x=180 x=60
If by one angle you mean the interior angle that would be 108. If you mean the central angle thats 72.