obtuse: greater than 90 degrees
right: 90 degrees
acute: less than 90 degrees
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An angle measuring more than 90 degrees is obtuse. An angle measuring less than 90 degrees is acute. An angle measuring 90 degrees is right.
obtuse angle
An angle measuring more than 90 degrees is considered an obtuse angle. However, if the angle is exactly 180 degrees, then it is considered a straight angle.
An angle which measures exactly 90 degrees is called a "right" angle. (One measuring less than 90 is 'acute', and one measuring more than 90 degrees is 'obtuse'.)
An angle ruler is a tool used to measuring angles like a protractor. An angle ruler is more accurate than a protractor.