A null angle and an acute angle are less than a right angle.
It is: "angle a is not a right angle" or "angle a is greater than or less than a right angle".
An acute angle is less than a right angle because it is greater than 0 but less than 90 degrees.
If an angle measures less than 90º, it is an acuteangle.
An acute angle has less than 90 degrees and a right angle has exactly 90 degrees, therefore an acute angle is smaller than a right angle.
An acute angle
Acute
aubtuse
An angle greater than 0 but less than 90 degrees is an acute angle
An acute angle.
An angle greater than 90 but less than 180 degrees is obtuse An angle greater than 0 but less than 90 degrees is acute A right angle measures 90 degrees
An acute angle is less than 90 degrees. it is smaller than a right angle.