Angle Alpha of Trigonometry is the value of the non-right angle of a right triangle used to calculate Trigonometric Ratios. And is denoted by α. Angle Alpha of Trigonometry is usually measured using the Degree for Angle. Note that the value of Angle Alpha of Trigonometry is always positive. Typically, the value of Angle Alpha of Trigonometry lies in the range from 0 to 90.