Acute angles

Here we shall look very briefly at acute angles. Among different types and sizes of angles is the acute angle. Acute angles smaller than a right angle (less than 90°) are called acute angles. Their size or measure is between zero and 90°. “Acute” meaning “sharp”. Below is an example of an acute angle.

When the term is given to a triangle: Acute Triangle, it means that all angles in the triangle are less than 90°.

It is important to note that the angle must be less than 90° to be defined as an acute angle, at 90° or beyond it is no longer referred to as an acute angle.