An [[1]] measures between 0° and 90°.

Angles are typically expressed in degrees. An acute angle is one that measures between 0° and 90°, making it smaller than a right angle (L shape). 

An acute angle is characterised by a horizontal "V" shape. 

Acute angles are a fundamental geometric concept with numerous applications. 

There are three basic types of angles: acute angles, right angles, and obtuse angles.