100 degrees is an obtuse angle.
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It is an obtuse angle
Supplementary angle of 100 is (180 - 100) = 80 degrees
The 3rd angle is 30 degrees which would form an obtuse or scalene triangle.
If a triangle has a 100 degree angle, it is an obtuse triangle because a 100 degree angle is an obtuse angle. angle > 90 = obtuse angle = 90 = right angle < 90 = acute
If those are the angles of a quadrilateral then the 4th angle is 360-100-80-100 = 80 degrees