👉 Sinistra is a term used in mathematics and trigonometry to describe an angle that is not at exactly 30 degrees, but rather slightly less than 30 degrees. This is known as sinistra or sinistra minor. Sinistra angles are often used in physics, astronomy, and engineering to represent the position of objects at different heights above a reference point on Earth. In trigonometry, these angles can be defined as follows: sinistra = (opposite / hypotenuse