An angle is the figure formed by two rays, called the sides of the angle, sharing a common endpoint, called the vertex of the angle. Angles are typically measured in degrees or radians.

An angle is the figure formed by two rays, called the sides of the angle, sharing a common endpoint, called the vertex of the angle. Angles are typically measured in degrees or radians.

Here are some common types of angles:

• An acute angle is an angle measuring less than $90^\circ$.
• A right angle is an angle measuring exactly $90^\circ$.
• An obtuse angle is an angle measuring greater than $90^\circ$ but less than $180^\circ$.
• A straight angle is an angle measuring exactly $180^\circ$.
• A reflex angle is an angle measuring greater than $180^\circ$ but less than $360^\circ$.