acute angle
an angle that measures less than 90 degrees
An acute angle is an angle that measures between 0 degrees and 90 degrees. It is smaller than a right angle (which measures exactly 90 degrees) and a obtuse angle (which measures between 90 degrees and 180 degrees). In other words, an acute angle is an angle that is sharp or narrow. Examples of acute angles include the angles formed by the hands of a clock when it shows the time between 1:00 and 3:00 or the angle between two adjacent sides of an equilateral triangle. Acute angles are commonly studied in geometry and trigonometry, and they have many applications in fields such as engineering, physics, and architecture.
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