An angle is a geometric figure formed by two rays (or lines) that share a common endpoint, known as the vertex. Angles are used to measure the amount of rotation or separation between these rays. They are typically measured in degrees or radians.

Explanation: This image shows the parts of angles.

The classification of angles is based on their measurements and relationships. There are various types of angles to consider, including acute, obtuse, straight, right, complete, reflex, complementary, and supplementary angles.

Explanation: This image shows the types of angles.