What is an acute angle defined as?

An acute angle is defined as an angle that measures less than 90 degrees. This means that when you visualize an acute angle, it appears sharper and more pointed compared to other types of angles. In the context of angle measurement, anything below 90 degrees fits the criteria for being classified as acute.

This definition distinguishes acute angles from right angles, which measure exactly 90 degrees, and obtuse angles, which measure between 90 and 180 degrees. Similarly, angles that exceed 180 degrees are categorized as reflex angles. Understanding these definitions helps in identifying and categorizing angles based on their measurements, which is a fundamental concept in geometry.