An obtuse angle is between 90 and 180 degrees
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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.
An angle greater than 0 but less than 90 degrees is an acute angle.
An angle greater than 0 but less than 90 degrees is an acute angle.
It is: "angle a is not a right angle" or "angle a is greater than or less than a right angle".
Answer: Obtuse Angle. Names of Angles: Acute Angle an angle that is less than 90° Right Angle an angle that is 90° exactly Obtuse Angle an angle that is greater than 90° but less than 180° Straight Angle an angle that is 180° exactly Reflex Angle an angle that is greater than 180°