An angle which measure exactly 90 degrees is called a right angle.
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An angle less than 90 degrees is called an acute angle.
the complement of an acute angle (less than 90 degrees) is 90 minus the angle which is 71 degrees in this case.
A right angle is an angle of 90 degrees.
There isn't a specific name for 45 degrees, like when 90 degree angle is called a "right angle". However, there is a general term for any angle less than 90 degrees - "acute angle". Here's a full list: < 90 degrees = acute 90 degrees = right angle between 90 & 180 degrees = obtuse 180 degrees = straight line between 180 & 360 degrees = reflex 360 deg = revolution (because it turns in a complete circle)
An angle of 90 degrees is normally called a right angle.An angle of 90 degrees is a right angle