For a given angle th each ratio stays the same no matter how big or small the triangle is. Check Maths definitions by letters starting from A to Z with described Maths images. Pairs of interior angles on opposite sides of the transversal.
Also equal to p2 radians.
A quaternion squares to 1 if and only if it is a vector quaternion with norm 1. A quaternion squares to 1 if and only if it is a vector quaternion with norm 1. Know what is Angle and solved problems on Angle. For a given angle th each ratio stays the same no matter how big or small the triangle is.