A 128 degree angle would be an "obtuse" angle. This is because the angle measurement exceeds 90 degrees. Anything below 90 degrees would be considered an "acute" angle.
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Oh, isn't that just a happy little angle you have there? A 128-degree angle is an obtuse angle, meaning it is greater than 90 degrees but less than 180 degrees. It's like a big, open arm reaching out to give your painting a warm, welcoming feel.
128 degrees.An angle's supplement, when added to the original angle, will form a straight (180 degree) angle.
An obtuse angle
When an angle has a measure of 120 degrees, it is an obtuse angle. When an angle is an obtuse angle its measure is between 90 and 180 degrees. That is: 90 degrees < obtuse angle < 180 degrees.
An angle that measures 142 degrees is classified as an obtuse angle. In geometry, an obtuse angle is an angle that is greater than 90 degrees but less than 180 degrees. It falls between a right angle (90 degrees) and a straight angle (180 degrees).