A three-quarter turn is 270°. An acute angle is less than 90°. An obtuse angle is between 90° and 180°. A reflex angle is between 180° and 360°. These are all right angles as they are all a ...

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See how cute it is? If an angle is greater than 90 degrees, but less than 180 degrees, it's called an obtuse angle. An angle greater than 180 degrees, but less than 360 degrees is called a reflex ...