acute angle
an angle that is less than 90 degrees
An acute angle is an angle that measures between 0 degrees and 90 degrees. This means that its measure is less than a right angle (exactly 90 degrees), and its sides are less than perpendicular to each other. Acute angles are commonly found in geometry problems, and they can be identified by their appearance- they are slim, pointed angles that appear to be sharp. Examples of acute angles include angles formed by the hands of a clock at any given hour, the angles at the corners of a triangle, and many others.
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