How do you describe a angle?

An angle is formed by two rays or lines that share a common endpoint, known as the vertex. It is measured in degrees or radians, representing the amount of rotation from one ray to the other. Angles can be classified based on their measurement, such as acute (less than 90 degrees), right (exactly 90 degrees), obtuse (greater than 90 degrees but less than 180 degrees), and straight (exactly 180 degrees). The notation typically used to describe an angle includes the vertex and points on each ray, like ∠ABC.