An obtuse angle is greater than 90 but less than 180 degrees
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An angle greater than 90 degrees.
An angle of 30 degrees is an acute angle because it is greater than 0 but less than 90 degrees
3 acute angles each measuring 60 degrees
An angle which is more than 180 degrees but less than 360 degrees is called a reflex angle.
The complement to an angle is how much it takes to make 90 degrees. The complement to 30 degrees is 60 degrees. The complement to 45 degrees is 45 degrees.