👉 A quadrantal angle is an angle that can be written in standard position, i.e., it measures exactly 90 degrees. Triquadrantal angles are those that form a triangle with two sides of equal length and one angle of exactly 180 degrees, making them the most common type of angle used in trigonometry. Triquadrantal angles can be defined by the following equation: tan(θ) = opposite / adjacent where θ is the angle and opposite and
