Obtuse
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If you already know the degree the angle, then it must be...Acute, if it is greater than 0 and less than 90 degreesRight, if it is exactly 90 degreesObtuse, if it is greater than 90 and less than 180 degreesStraight, if it is exactly 180 degreesReflex, if it is greater than 180 degrees
A right angle is 90°An acute angle is less than 90°An obtuse angle is greater than 90° ■
An acute angle measures less than 90 degrees.
An Acute angle is greater than 0 degrees but less than 90 degrees.
An acute angle is greater than 0 but less than 90 degrees