How do you find the positive acute angle?

Hint: To solve the given question first we need to recall the definitions of angles, acute angles and positive and negative angles. Then by analyzing the definitions we will get the desired answer.

Complete step by step solution:
We know that when two lines intersect at a point angle is formed at the point of intersection. The two lines are known as the arms or sides of an angle.
We know that angles can be of two types based on the direction of rotation i.e. positive angles and negative angles. Positive angles are the angles determined from the base in the counterclockwise direction. The angle drawn from the origin towards the positive X and Y axis is a positive angle. Also the angle measures between $0{}^\circ $ to $90{}^\circ $ is known as acute angle.
For example in the below diagram an angle measures $40{}^\circ $ is a positive acute angle.

Hence an angle measuring $0{}^\circ $ to $90{}^\circ $ in counter clockwise direction is a positive acute angle.

Note: The point to be noted is that the angle drawn from the origin towards the negative plane is known as the negative angle. Negative angles are also determined from the base in the clockwise direction. We have other types of angles as obtuse angles, right angles, straight angles and reflex angles. These angles are categorized according to their degree of measure.