angle
A figure formed by two rays with a common endpoint
An angle is a geometric figure formed by two rays (or line segments) that share a common endpoint, known as the vertex of the angle. The rays forming the angle are referred to as the sides or legs of the angle. Angles are usually measured in degrees or radians, and denote the amount of rotation needed to bring one ray into coincidence with the other. The size of an angle is usually denoted by a Greek letter such as θ (theta) or α (alpha). Angles can be classified based on their size, such as acute (less than 90 degrees), right (exactly 90 degrees), obtuse (greater than 90 degrees but less than 180 degrees), or straight (exactly 180 degrees).
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