An acute triangle is defined as a triangle where all three of its interior angles are less than 90 degrees. Therefore, in an acute triangle, there are exactly three acute angles.
To elaborate, an angle is considered acute if its measure is greater than 0 degrees but less than 90 degrees. Since the sum of the interior angles of any triangle is always 180 degrees, having all three angles as acute ensures that this condition is satisfied. Hence, an acute triangle must contain three acute angles, making it a unique and distinct type of triangle in geometry.