Angle

Angle

The separation of between two straight lines joining at a point is called an angle. When two line segments have a single common point, then an angle is formed at that point.

In the given figure, two line segments AB and BC have a single common point B, then angle ABC is formed at B. It is represented by the symbol ‘∠’ while writing. The angle can be writen as ∠ABC or ∠CBA.

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Types of Angles

According to the measure of an angle, there are different types of angles as follows:

Right angle

An angle whose measure is exactly 90° is called a right angle. 

In the given figure, ∠ABC is 90°. So ∠ABC is marked as a Right Angle by a small square at B.

Acute Angle

An angle which is less than 90° and more than 0° is called an acute angle. 

In the given figure, ∠QPS = 60° which is less than 90°. So ∠QPS is an acute angle.

Obtuse Angle

An angle which is less than 180° and more than 90° is called an obtuse angle. 

All angles between 90° to 180° are called obtuse angles. In the given figure ∠AOB is more than 90° but less than 180°. i.e. ∠AOB = 135°. So, ∠AOB is an obtuse angle.

Straight Angle

An angle of exactly 180° is called a straight angle. 

In the given figure, ∠ABC = 180°. So ∠ABC is a straight angle.

Reflex Angle

The angle which is less than 360° and more than 180° is called a reflex angle. 

In the given figure, ∠XYZ = 220°, which is less than 360° and more than 180°. So ∠XYZ is an reflex angle.

Full Turn Angle

The angle which is equal to 360° is called a full turn angle (complete angle). 

In the given figure, ∠ABC = 360°. So, ∠ABC is a full turn angle.