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An obtuse angle is greater than 90o and less than 180o.
Right angle. An acute angle is less than 90°. An obtuse angle is more than 90°. If it isn't less than or greater than, it must be equal to. Of course a straight angle is more or less an extreme case of an obtuse angle.
Obtuse. An acute angle is less than 90 degrees, a right angle is 90 degrees, and an obtuse angle is more than 90 degrees.
An angle of 154 degrees is an obtuse angle because it is greater than 90 but less than 180 degrees
125° angle is an obtuse angle. An obtuse angle is any angle that is greater than 90° and less than 180°