1 Trigonometric ratio : In Δ ABC, ΔB = 90°. For Angle A, sin A = Perpendicular / Hypotenuse = Opposite side / Hypotenuse cos A = Base / Hypotenuse = adjacent side / Hypotenuse tan A = Perpendicular / Base = Opposite side / adjacent side cot A = Base / Perpendicular = adjacent side / opposite side sec A = Hypotenuse / Base = Hypotenuse /...