👉 The term "cotwist" is a mathematical concept in geometry that refers to the angle formed when two lines intersect. It can be thought of as the exterior angle of an equilateral triangle, which measures 120 degrees. In geometry, a cotwist occurs when a line intersects another line at a right angle, forming a smaller angle with the first line. This is because if you have two lines that are perpendicular to each other (meaning they form a right angle), then their