An obtuse angle has its measure between 90 and 180 degrees.
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90o < obtuse angle < 180o
It is an angle whose measure is between 90 and 180 degrees.
It is any angle greater than 90 degrees but less than 180 degrees
It's less than a obtuse angle and right angle. A acute angle has degrees between 0 degrees and 89 degrees.
An obtuse angle is an angle between (but not including) 90 and 180 degrees, so some obtuse angles would be 91 degrees, 179 degrees, and 142 degrees.