That is called an acute angle.
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A angle less than 90 degrees is a acute angle.
An Acute Angle is the kind of angle that is less than 90 degrees.
Acute angle: greater than 0 but less than 90 degrees Right angle: 90 degrees Obtuse angle: greater than 90 but less than 180 degrees Reflex angle: greater than 180 but less than 360 degrees
An angle greater than 0 but less than 90 degrees is an acute angle
An angle that is less than 90 degrees is known as an acute angle.