An angle is a geometric figure formed by two rays or line segments that share a common endpoint, called the vertex.
Angles are measured in degrees and can vary in size from 0 degrees (a flat angle with both rays lying along the same line) to 360 degrees (a full circle).
Common types of angles include right angles (90 degrees), acute angles (less than 90 degrees), obtuse angles (more than 90 degrees but less than 180 degrees), and straight angles (180 degrees).
Angles are fundamental in geometry and trigonometry, used to describe shapes, rotations, and relationships between lines.