An obtuse angle
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An obtuse angle is one that measures more than 90° and less than 180°.
If an angle measures less than 90º, it is an acuteangle.
A triangle which measures less than 90%
Obtuse Angles are more than 90° but less than 180° so 175o is an obtuse angle.
An angle measuring 55 degrees is an acute angle since it is measures less than 90 degrees.