The measure of an acute angle is always$<{90}^0$

Angles are typically expressed in degrees. An acute angle is one that measures between $0°$ and $90°$, making it smaller than a right angle ( $\mathrm{L}$ shape).
A horizontal "V" shape characterizes an acute angle.
Acute angles are a fundamental geometric concept with numerous applications.
There are three basic types of angles: acute angles, right angles, and obtuse angles.
Hence, the measure of an acute angle is always $<{90}^{\mathrm{o}}$