acute angle
an angle that measures less than 90 degrees
An acute angle is an angle whose measure is greater than 0 degrees and less than 90 degrees. In other words, it is an angle whose vertex lies between two intersecting lines that form an angle of less than 90 degrees. Examples of acute angles include angles formed by a corner of a square or a right-angled triangle. Acute angles are commonly seen in geometry, trigonometry, and physics. They are contrasted with obtuse angles, which measure greater than 90 degrees but less than 180 degrees, and with right angles, which measure 90 degrees.
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